您已经了解了函数索引的定义以及其使用方式和使用时机。
You have now learned the definition of a functional index and have seen how and when to use them.
其完美的使用时机和施放位置需要练习，但这绝对值得。
It takes some practice to know where and when to place the shockwave but the effort is worth it.
这会减少使用时机的详细资料时所需储存机制中的空间数量。
This reduces the amount of space that is required in the repository when timing details are used.
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