这时产品对象已经被转换成为了正确的类，所以您不需要自己再次的转换它。

This was already cast as the correct class of product object, so you do not need to cast it yourself.

youdao

这时产品对象已经被转换成为了正确的类，所以您不需要自己再次的转换它。

This was already cast as the correct class of product object, so you do not need to cast it yourself.

youdao