该编译过程牵涉到授权检查、优化，以及将语句转化为可执行格式时所需的其他一些活动。

This compilation process involves authorization checking, optimization, and other activities necessary to convert the statement into an executable form.

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准备好的语句可重新编译，从而获得更好的性能，在您反复执行同一操作时，它非常方便。

Prepared statements are recompiled for better performance and are convenient when you need to do the same thing over and over again.

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Ceylon还确认(在编译时)switch语句包含详尽的实例测试列表，至少包含else子句，从而提供完整的覆盖范围。

Ceylon also ensures (at compile time) that the switch statement contains an exhaustive list of instance tests or, at a minimum, an else clause to provide complete coverage.

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