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. the quality of being unstable and insecure
e.g. the shakiness of the present regime
2. a shaky motion
e.g. the shaking of his fingers as he lit his pipe
Synonym: shakingtremblingquiverquiveringvibrationpalpitation
多通过句子记忆单词，而不是单独死记硬背。
