buoyan
cy
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乐观, 自信
a feeling of hopefulness and confidence that makes one remain cheerful, especially in sad or unpleasant situations
同义词：
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浮力, 阿基米德原理
the tendency of an object to float or rise in a fluid, like water or air, due to the upward force exerted by the fluid
- Life jackets rely on buoyancy to keep people safe in water.
救生衣依靠浮力来确保人们在水中的安全。
- Hot air balloons use buoyancy to lift into the sky.
热气球利用浮力升入天空。
- Ships are designed with buoyancy to stay afloat in the ocean.
船舶设计有浮力以在海洋中保持漂浮。
- Submarines control buoyancy to dive and surface underwater.
潜水艇控制浮力以在水下潜水和上浮。
- Understanding buoyancy helps engineers design efficient boats and submarines.
理解浮力有助于工程师设计高效的船只和潜艇。
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