V to become fainter, quieter, or weaker 逐渐减弱
his voice trailed off
The crowd began to trail off when the speaker continued for over an hour.
发言的人接连不断地讲了一个多小时，听众开始无精打采地走开了。
Cabell let his words trail off when he realized that no one was listening to him.
卡贝尔把声音降低了，他意识到没有人在听他说话。
The effects of water and ice, too, are likely to be intermittent, and to trail off a bit as the reserves on top of the mountain are used up.
冰和水所产生的作用是断断续续的，然后当山顶的冰、水消耗殆尽时，爆炸也就渐止了。
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