那群观鸟爱好者凌晨四点就出发去森林，希望能看到罕见的猫头鹰。

The ___twitchers set out at 4 a.m. to the forest, hoping to spot the rare owl.

那位老人是个严重的抽搐患者，他的手总是不由自主地抖动。

The old man is a severe ___twitcher; his hands keep shaking involuntarily.