jerky

Compared meaning: sudden, quick movement or change (adjective).

比较义项：突然、急促的（动作或变化）（形容词）。

• sudden

  Describes any event, change, feeling or single action that happens quickly and without warning; broad and neutral, not specifically about uneven physical movement.

  可形容任何突然发生、出人意料的事件、变化或感觉，用法较宽泛，并不特指动作本身不平稳。

  She felt a sudden urge to laugh during the meeting.

  她在会议中突然有一种想笑的冲动。

• jerky 本词

  Describes physical movement that is abrupt, uneven and stop-start, often repeated, like a shaky machine or a nervous person; not used for events or feelings.

  专指身体动作生硬、不平稳、一顿一顿的，常常反复出现，比如机器运转不稳或人紧张时的动作；不用来形容事件或感觉。

  His nervous hands made jerky movements as he tried to steady the camera.

  他紧张的双手在稳住相机时动作一顿一顿的。

Both words describe sudden, quick action or change. Sudden means something happens fast and unexpectedly; it can describe any event, change, or feeling. Jerky describes movement itself as rough, uneven, and stop-start, often repeated. Jerky as a noun meaning dried meat is not compared here.

这两个词都能形容“突然、急促”的动作或变化，但侧重不同：sudden 强调事情发生得快、出人意料，可用于任何事件、变化或感觉；jerky 专指动作本身不平稳、一顿一顿的，常带反复、生硬的意味。这里不比较 jerky 作名词时表示“牛肉干”的意思。