动作的速度和力度用来表示语气的强弱。

Speed and strength of movement allow for intonation.

youdao

可以当连词用，表示语气的转折。虽然他老了但是仍然很活跃。她很年轻但有智慧。

Rob: Finally, you can also use 'yet' as a conjunction to mean 'but'. 'He is old, yet quite active. She is young yet wise. '

youdao

另一人写道。 三封邮件的语气都表示，她们有被迫做某种不确定事情的感觉，这使我深感不安。

The tone of all three emails was of feeling forced into something they weren't sure about, and it made me feel acutely uncomfortable.

youdao

Yeah. Absolutely. A lot of emphasis, a lot of variation in tone, and the italics are part of the representation of that.

对，绝对是的，很多的强调，很多语气上的变化，而斜体字就是它的表示方法之一。

耶鲁公开课 - 1945年后的美国小说课程节选