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。
2
Our monitor will limit each speaker to five minutes.
我们班长将把每人的发言时间限定在5分钟以内。
3
Where the original Fontaine was a large, stand-mounted monitor, in its second incarnation, the speaker has been transformed into a small, elegant floorstander.