drop arm的用法和樣例：
例句
- Remove the cotter pin and nut from the drag link at the pitman arm.
從轉向拉杆上拆下轉向搖臂處的開口銷和螺母。 - The room that was being prepared for you has a lever which will open a trap door designed to drop people below, and you could climb down from there.
在為你準備的房間里有一條操縱桿可以控制一個陷阱門，原本能出其不意地讓人墜落，或許你可以順著那裡爬下去。
