As previously mentioned, this API hides which concrete implementation is actually used.

正如前面提到的，该API对实际使用哪个具体实现加以隐藏。

youdao

As previously mentioned, this API hides which concrete implementation is actually used.

正如前面提到的，该API对实际使用哪个具体实现加以隐藏。

youdao