由于紧张，他端起咖啡杯时手有些发抖。

Due to nervousness, there was a noticeable ___shakiness in his hands as he lifted the coffee cup.

他声音里的颤抖透露出对计划可行性的不确定。

The ___shakiness in his voice revealed his uncertainty about the plan's feasibility.

面试前他的手一直在抖，明显有些紧张。

His hands showed obvious ___shakiness before the interview, revealing his nervousness.