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

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。

youdao

Where the original Fontaine was a large, stand-mounted monitor, in its second incarnation, the speaker has been transformed into a small, elegant floorstander.

原来的芳婷是一个很大落地箱，在其二代化身后箱体已经变得很小巧、优雅、地轴承架。

youdao

Last year, Dutch chip-maker NXP released a new type of mobile audio component -- the TFA9887 -- that allowed a mobile device to monitor its speaker system in real-time in order to max out volume without risking damage to the driver.

ENGADGET