mercury drop fall detector 汞滴检测器
free fall drop 自由落体坠击 ; 自由跌落
drop kick fall 飞腿踢倒
Fall behind or drop 逆水行舟不进则退 ; 逆水行舟
fall drop in series 梯级跌水
Then, holding out her arm, she let one drop fall from it on the snow beside the sledge.
然后,她伸出手臂,从瓶里倒出一滴东西滴在雪橇旁边的雪地上。
The next drop fall from the same spot and gradually form a stone "icicle," called a stalactite, which hangs from the cave's ceiling.
另一滴水从同一地方滴下,渐渐地形成一个石头“冰柱”,叫做钟乳石,悬挂在洞穴顶上。
A lot of teachers spend weeks playing catch up in the fall to make up for the summer drop.
很多老师在秋季学期花几个星期的时间补上暑假落下的功课。
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