Checking is easy but expensive (you have to make an extra call to SimpleDB, which is slow since it's a whole HTTP round trip plus the processing time on Amazon's side).

要进行检查也很简单，但是需要付出开销(您必须额外调用SimpleDB，而调用会很慢，因为需要完整的HTTP往返以及amazon端的处理时间)。

youdao

Can I call back yesterday's wounds and make them whole?

我能扶平昨日的创伤吗？

youdao

Can I call back yesterday's wound and make them whole?

我能扶平昨日的创伤吗？

youdao

Can I call back yesterday's wound and make them whole?

我能扶平昨日的创伤吗？

youdao