我的世界Minecraft Java版17w49a发。每周快照是Minecraft的测试机制，主要用于下一个正式版的特性预览。然而，每周快照主要用于新特性展示，通常存在大量漏洞。因此对于普通玩家建议仅做测试尝鲜用。使用测试版打开存档前请务必备份。适用于正式版的Mod不兼容快照，且大多数Mod都不对每周快照提供支持。Minecraft 1.13 仍未发布，17w49a为其第9个预览版。
Minecraft 快照 17w49a
Java版 1.13 的快照
This weeks snapshot brings us bug fixes! Lots of bug fixes.
这一周的快照都是修漏洞!修了很多漏洞。
17w49a的更改
Added new data concept: 'tags'
增加了新的数据概念：'tags'
Lots of bug fixes!
修了很多漏洞!
Tab now also cycles the command suggestions again
Tab再次可以循环选择命令提示了
修复的漏洞：
Fixed bugMC-99321- Hoppers cannot pull items from double chests if second chest is blocked
如果第二个箱子被锁，漏斗无法从大箱子吸出物品
Fixed bugMC-121282- Server icons erased on loading multiplayer menu
服务器图标在加载多人游戏菜单时消失了
Fixed bugMC-121631- Taking items from the creative inventory search tab no longer resets search text
从创造模式物品栏的搜索选项卡中拿出物品后不再重置搜索文本
Fixed bugMC-121632- Pressing "chat" key selects search in creative inventory/recipe book AND types the letter
按下“聊天”按钮会转到创造模式物品栏/配方书，并输入相应字母
Fixed bugMC-121648- "Difficulty" in settings is untranslated and lowercase
“难度”选项未翻译，且为小写形式
Fixed bugMC-121665- Key "None" display string as "oard.-1"
键位“无”会显示字符串“oard.-1”
Fixed bugMC-121705- Cursor is offset from actual mouse location when opening GUIs while moving mouse
在移动鼠标时打开GUI界面，会导致光标位置偏离实际位置
Fixed bugMC-121709- The clickable area to sort the statistics menu are not in the right place
统计菜单里的可点击区域不在恰当的位置
Fixed bugMC-121714- Unable to save screenshot of PNG format
无法将截屏保存为PNG格式
Fixed bugMC-121718- You can not select the spectator menu
无法选择旁观者菜单
Fixed bugMC-121808- Command argument validation for single entity says player in some error messages
对于只容许单个实体的命令参数，错误信息写的是“玩家”一词
Fixed bugMC-121873- Dark background missing from beacon GUI
信标GUI缺失黑色背景
Fixed bugMC-122148- No Block, Item, Mob, GUI, or any other texture renders -- No sounds play
无方块、物品、生物、GUI，或其他所有材质的渲染——没有声音播放
Fixed bugMC-122270- Pushing blocks with connections doesn't update them
推动有连接的方块不会导致更新
Fixed bugMC-122295- Backups folder is created outside of the server directory when using a dedicated server
使用专门服务器时，备份文件夹创建在了服务器目录之外
Fixed bugMC-122309- '/gamerule gameLoopFunction' does not tab complete function names
'/gamerule gameLoopFunction'无法自动补全函数名称
Fixed bugMC-122314- All maps created in earlier versions are now the same
所有早期版本的地图都变成一样的了
Fixed bugMC-122355- Crash on breaking banner: sCastException: arw cannot be cast to aru
破坏旗帜时崩溃：sCastException: arw cannot be cast to aru
Fixed bugMC-122383- Pre-existing chests invisible, overlapping
预先存在的箱子有不可见、重叠的问题
Fixed bugMC-122395- Custom player heads are called "er_headnamed"
自定义玩家头颅的名称为"er_headnamed"
Fixed bugMC-122492- Debug stick can be used by non-op players
非管理员玩家可以使用调试棒
Fixed bugMC-122521- Damaged anvil always turns to the North
损坏的铁砧永远朝南
Fixed bugMC-122536- "set_nbt" function in loot table does not merge NBT to item
战利品表的"set_nbt"功能无法合并NBT标签到物品中
Fixed bugMC-122558- Health criteria scoreboard objectives do not use hearts to display value anymore
Health类记分版目标不再使用心形显示值了
Fixed bugMC-122573- Crash due to carpet and sticky pistons
因地毯和粘性活塞导致的崩溃
Fixed bugMC-122584- Incorrect format string order in statistics
统计中有不正确的格式字符串顺序
Fixed bugMC-122625- Order of contents of north- and east-facing double chests changed after update
更新之后，朝北和朝南的箱子中物品的顺序会改变
Fixed bugMC-122639- Can't place lily pads on ice
无法在冰上放置睡莲
Fixed bugMC-122643- Snow, carpet and daylight detectors culling adjacent upper slabs
雪、地毯和日光检测器会导致邻接的上半砖渲染出错
Fixed bugMC-122644- Datapacks cannot replace vanilla crafting recipes.
数据包无法替换纯净合成配方
Fixed bugMC-122646- Attempting to add cullface to glass panes does not work
向玻璃板添加剔除面不起作用
Fixed bugMC-122650- Player heads aren't affected by upgrade paths, renamed to "er_headnamed" + head texture does not show, only when placed
玩家的头不会被路径更新影响，被重命名为"er_headnamed + 头部材质在放置后不显示
Fixed bugMC-122718- Dirt border of "video settings" menu encroaching too far on settings
“视频设置”菜单的泥土材质在设置界面延伸过远
标签
Items & blocks can be "tagged" with an ID, to make testing for things much easier. For example, checking if a block is "wool" with a command needs to actually test for every wool-like block individually. Now you can test if it matches the tag minecraft:wool, instead.
物品和方块可以“贴上”一个ID标签，使得测试更为简便。例如，要用一条命令检测一个方块是不是“wool”，实际上需要分别检测所有羊毛类的方块。现在你可以检测方块是否匹配标签“minecraft:wool”了。
标签的类型
Currently there's block tags and item tags. You use block tags when testing for blocks in the world, and item tags for testing for items (even block-items) in inventories. It may seem like we could just stick with item tags, but not every block has an item!
目前有的是方块标签和物品标签。你可以用方块标签检测世界中的方块，同时可以用物品标签检测物品栏中的物品(包括方块物品)。看起来我们可以只用物品标签，但是不是所有方块都有物品形式!
创建标签
Inside data packs, you can create a file at data/(namespace)/tags/blocks/ to make a block tag called namespace:foo, which contains a list of blocks that should be tagged with namespace:foo.
在数据包内，你可以在 data/(命名空间)/tags/blocks/ 的位置创建一个文件，这样就会创建一个名为 命名空间:foo 的方块标签，里面包含着应该被贴上 命名空间:foo 的方块列表。
工作进展
There's not many default tags (both item & block have minecraft:planks and minecraft:wool currently, that's it). We're migrating things over to it, still.
现在还没有很多的默认标签(具体说就是，物品和方块目前只有minecraft:planks和minecraft:wool而已)。我们仍在进行迁移到标签的工作。
配方
Recipes can now refer to a tag instead of an item. This should save a few hundred thousand lines of code, somewhere.
在物品之外，配方现在可以指定标签了。这可以在某些地方节省好几万行代码了吧。
安装快照
Please report any and all bugs you find in Minecraft to . If nobody reports a bug, we can’t fix it! experimental development snapshots” and save. To switch to the normal version, you can select it in the dropdown at the bottom left corner of the launcher. Back up your world first or run the game on in a different folder (See the “new profile” dialog). Snapshots can corrupt your world, please backup and/or run them in a different folder from your main worlds.请在报告Minecraft中的BUG。如果没人汇报BUG的话，我们无法修复它!如果你想试玩快照，请打开官 方启动器并点击“New Profile”按钮，选中“snapshots”并选择“Enable experimental development snapshots”并点击保存。如果想切换到普通的版本，你可以在启动器左下角按钮上方的下拉菜单中选择。在开始快照前备份你的世界或在不同的文件夹中启动快照(见“new profile”对话框)。快照可能会玩坏你的存档，请千万记得备份存档和/或在与你的存档不同文件夹里运行。