Don't put pressure on yourself to get to your previous level.
不要想达到以往的水平而给自己压力。
When you get a few levels down, it's easy to forget where you started, or what the previous level was called.
当您向下几层后,很容易忘记您开始的地方,或者上一层的名称。
Should you need it, it is also possible to rollback a migration to a previous level which you select, again with a single command.
如果需要,还可以使用一个命令将迁移回滚到您选择的以前级别。
And I want you to get used to this, that colon is important, it identifies the start, and then the set of indented things identify all the things at the same level, and when we reset back to the previous level, that's when we go back to where we were.
我希望大家熟悉这个结构,冒号很重要,它定义了开始的地方,然后缩进号代表着,同样一层的对象,当我们到了,不缩进的地方的时候,也就到了以前的状态。
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