逐渐减弱：某种现象、声音等逐渐减弱，频率、强度或音量降低，也可以随着时间的推移更快地减少。
trail away //
动词 to become fainter, quieter, or weaker 逐渐减弱
his voice trailed off
... track down追踪至俘获；调查探索至发现 trail off（声音等）逐渐变弱 try on试穿 ...
... track down 追捕 trail off 缩小；减弱 transplant vt. 移植；迁移；使移居 n. 移植；移植器官；被移植物；移居者 vi. 移植；迁移；移居 ...
... track out 根据（遗迹等）探索出 trail off （声音等）变弱 treat sb. as 把…待如；把…看作 ...
尾音拖奏（Trail off）（拖音） 拖音的效果和滑音正好相反，它是先吹奏一个音符，再滑向另一个不确定的音符。
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。
On the remote Hermit's Trail off the South Rim of the Grand Canyon, a rare occurrence of rain brings joy to a cold November day.
时下正值冬季，天寒地冻，举目萧条。 在大峡谷南缘的隐士步道——美国的西北角落，一道彩虹罕见地划空而出，叫人好生欢喜。
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。
"Then we started to go off the trail into the woods, and the kids were floored.
VOA : standard.2010.06.25
Over the next several years (to 2015) economic growth could trail off as fiscal stimulus subsides.
Write performance is the strong suit, staying closer to the ideal where others sometimes trail off quickly.
Each good moment seemed to trail off into confusion and indirection.