By noting their expressions, a speaker can often monitor whether he is speaking loudly enough, too quickly or slowly, at too difficult a level, etc.

即由观察听众的表情，演讲人就可以知道他的音量是否够大，说得太快还是太慢，程度是否过难等等。

youdao

By noting their expressions, a speaker can often monitor whether he is speaking loudly enough, too quickly or slowly, at too difficult a level, etc.

即由观察听众的表情，演讲人就可以知道他的音量是否够大，说得太快还是太慢，程度是否过难等等。

youdao