nervous

I always get nervous when I have to speak in front of a large group.

(Chinese) 当要在很多人面前演讲时，我总是会感到紧张。

She gave a nervous laugh as she waited for the test results.

(Chinese) 在等待考试结果时，她神经质地笑了一下。

The nervous system controls all the voluntary actions of the body.

(Chinese) 神经系统控制着身体的所有自主行动。

Multiple sclerosis is a chronic disease that affects the central nervous system.

(Chinese) 多发性硬化症是一种影响中枢神经系统的慢性疾病。