reaction

Her first reaction to the sudden proposal was to look away in surprise.

(Chinese) 面对突如其来的求婚，她的第一反应是惊讶地看向别处。

Professional athletes train specifically to improve their reaction times.

(Chinese) 职业运动员专门进行训练以提高他们的反应时间。

A severe allergic reaction to the new drug was reported in three patients.

(Chinese) 据报道，三名患者对这种新药产生了严重的过敏反应。

The chemical reaction releases a large amount of heat when oxygen is added.

(Chinese) 当加入氧气时，该化学反应会释放出大量的热。