名词浮力; （物体在液体里的）浮性; （从失望、噩耗等中）恢复正常的能力; （价格、营业状况等的）维持力
1. 浮力
Buoyancy is the ability that something has to float on a liquid or in the air.
e.g. Air can be pumped into the diving suit to increase buoyancy.
可以给潜水衣充气以增大浮力。
2. 乐观；开朗
Buoyancy is a person''s ability to remain cheerful, even in sad or unpleasant situations.
e.g. I''ll have to take stock, go carefully and regain my buoyancy.
我将不得不审时度势，小心行事，同时保持乐观。
3. 愉快的心情
Buoyancy is a feeling of cheerfulness.
e.g. ...a mood of buoyancy and optimism.
乐观愉快的心情
4. （经济的）繁荣
There is economic buoyancy when the economy is growing.
e.g. The likelihood is that the slump will be followed by a period of buoyancy.
萧条过后经济有可能会出现一段时期的繁荣。
noun
1. irrepressible liveliness and good spirit
e.g. I admired his buoyancy and persistent good humor
Synonym: irrepressibility
2. the tendency to float in water or other liquid
3. the property of something weightless and insubstantial
Synonym: airiness
4. cheerfulness that bubbles to the surface
Synonym: perkiness