点击下方单词,选择对的这个单词
点击下面链接下载与本句相关的学习资源，包括PDF教材和音频练习，方便课后复习：
1. (声音)逐渐减弱，越来越小 If a speaker's voice or a speaker trails off or trails away, their voice becomes quieter and they hesitate until they stop speaking completely.
多通过句子记忆单词，而不是单独死记硬背。
