咖啡因过量让他感到一阵紧张不安，手指不停地敲打着桌面。

Too much caffeine gave him a noticeable ___twitchiness, making his fingers tap nervously on the table.

喝太多咖啡后，他的手部不自主抽搐越来越明显。

After drinking too much coffee, the ___twitchiness in his hands became more noticeable.