I have looked at three specific tools in this class (but others probably exist).

我已查看过本课程中的三种特定工具(但也可能有其它工具存在)。

youdao

At present, there exist some problems in music class in middle school.

现阶段，中学音乐教学课程中存在着一些令人不太满意的问题。

youdao

At present, a modifier of the class does not exist in China.

目前国内还没有此类改性剂。

youdao

At present, a modifier of the class does not exist in China.

目前国内还没有此类改性剂。

youdao