但他很快又想到，既然拿的是一张黄护照，所谓自由也就是那么一回事。
He very speedily perceived what sort of liberty it is to which a yellow passport is provided.
修改对象文件的过程是自动的 — 也就是说，您指定对象文件，过程会修改文件并把修改保存回源代码文件。
The process of modifying the object files occurs in place — that is, you specify the object file and the process modifies the file saving the changes back into the source file.
SIGNAL 语句回滚由触发语句（也就是我们的 update 语句）尝试的更改。
The SIGNAL statement rolls back the changes that were attempted by the triggering statement (that is, our update statement).
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