The query compiler expands view definitions into the main statement block, which might result in a more complex statement.

查询编译器将视图定义展开成主语句块，从而产生一个更复杂的语句。

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It also ensures that the compiler does not move instructions from inside a synchronized block to outside (although it can in some cases move instructions from outside a synchronized block inside).

它也确保了编译器不会把指令从一个同步块的内部移到外部(虽然在某些情况下它会把指令从同步块的外部移到内部)。

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The compiler can observe that there is a sequence of adjacent blocks that operate on the same lock, and merge them into a single block.

编译器可以观察到有一个顺序的相邻块对同一个锁进行操作，并会把它们合并到单一块内。

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