短语词组短語buoyance module 浮力組件negative buoyance 負浮力external buoyance 外部浮力low buoyance 小儲備浮力reserve buoyance 儲備浮力full buoyance 巡航狀態net buoyance 淨浮力buoyance flux 浮力通量intact buoyance 完整浮力 返回 buoyance