Before you can use this tool, you must create the EXPLAIN tables for the database.

使用该工具前必须创建数据库的explain表。

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That makes them a good teaching tool to explain how real science works.

这种错误往往会变成一个很好的教学工具，来解释真正的科学是如何运作的。

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That makes them a good teaching tool to explain how real science works.

这种错误往往会变成一个很好的教学工具，来解释真正的科学是如何运作的。

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