This will perform the given operation at compile time.
它可以在编译时执行给定的操作。
More specifically, it will perform the given operation at macro-expansion time, which is not always the same as compile time in Scheme systems.
更具体地说，它是在宏展开时执行给定的操作，在Scheme系统中宏展开与编译并不总是同时进行的。
A dynamic object is assumed at compile time to support any operation, and only at runtime will you get an error if it wasn't so.
在编译时，会假设动态对象支持任何操作，而如果它不支持某个操作，则只有到运行时才能得到错误。
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