[mass noun]the ability or tendency of something to float in water or other fluid 浮性 ■the power of a liquid to keep something afloat 浮力 ■(figurative)an optimistic and cheerful disposition (喻)轻松愉快的心情 ■(figurative)a high level of activity in an economy or stock market (喻)回升,(经济或股市)活跃 there is renewed buoyancy in the demand for steel. 钢铁需求又有回升。