救生衣能帮助你在水中保持漂浮状态。
The life jacket helps you maintain ___buoyancy in the water.
他的乐观精神在困难时期鼓舞了整个团队。
His ___buoyancy inspired the whole team during difficult times.
游泳圈提供的浮力让孩子能够轻松漂浮在水面上。
The ___buoyancy from the swim ring helps the child float easily on the water.
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