n.浮力，愉快的心情，(经济的)繁荣

The buoyancy of a ship is what keeps it afloat on the water.
浮力使船在水上保持漂浮。
The balloon's buoyancy allows it to rise into the sky.
气球的浮力使其升入天空。
A hot air balloon relies on its buoyancy to maintain altitude.
热气球依赖其浮力来维持高度。
The diver's weight was too great for the water's buoyancy, causing him to sink.
潜水员的体重超过了水的浮力，导致他下沉。
The underwater diver experiences a decrease in buoyancy as they descend.
潜水员下潜时会感受到浮力的下降。
The foam on a life jacket provides buoyancy to keep someone afloat in water.
救生衣上的泡沫提供浮力，使人能在水中漂浮。
The material used to make a submarine is designed to minimize buoyancy changes underwater.
潜艇所用材料旨在减少在水下的浮力变化。
Buoyancy plays a crucial role in the functioning of hydroponic systems.
浮力在水培系统的运作中起着关键作用。
A swimmer uses their body position to counteract buoyancy and improve stroke efficiency.
游泳者通过调整身体姿势来抵消浮力，提高划水效率。
Engineers calculate the buoyancy force needed to design safe life-saving rafts.
工程师们计算出救生筏所需的浮力，以确保其安全。