不但如此，这还非常的易用好使。
Not only that, it's very easy to use and it works really well.
该实用程序还非常灵活，允许每个开发人员根据他们自己的偏好使用。
The utility is also flexible enough to allow each developer to have their own preferences.
EXTRACT函数是选择一组值的非常高效的方法，但是如果预期的结果集只是单一对象，那么最好使用前面介绍的choose函数。
The EXTRACT function is a very efficient way to select a group of values, but if the expected result set is just a single object then you are better off using the CHOOSE function previously discussed.
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