He had lost a lot of weight and was still pale, but he was back to his old buoyant and aggressive self.
体重下降了很多，脸色仍然苍白，但又恢复了他活泼好斗的本性。
The guyed tower is buoyant and floats, which means that less steel is needed in its construction because it does not have to support its own weight.
绷绳稳定塔可以漂浮并浮动，这意味着在建造过程中需要较少的钢材，因为它不需要支承其自身的重量。
The buoyant force up equals the weight down.
向上的浮力等于向下的重量。
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