形容詞 buoyant:

1. tending to float on a liquid or rise in air or gas
   同義詞：floaty
2. characterized by liveliness and lightheartedness
   同義詞：chirpy, perky

1. In a buoyant mood.
   輕松的心情
2. The raft would be more buoyant if it was less heavy.
   木筏若輕一點浮起的就更好了。
3. Salt water is more buoyant than fresh water.
   鹽水比淡水浮力大。

buoy.ant

adj.（形容詞）
Having or marked by buoyancy:
有浮力的：有浮力的，顯示浮力的：
例句：
a buoyant balloon; buoyant spirits.
一個漂浮起來的氣球；高漲的情緒

Lighthearted; gay:
輕松的，輕快的；活潑的：
例句：
in a buoyant mood.
輕松的心情

來源：
Spanish boyante [present participle of] boyar [to refloat a boat]
西班牙語 boyante [] boyar的現(xiàn)在分詞 [使船再次浮起]
from boya [buoy]
源自 boya [浮標]
from Old French boue * see buoy
源自 古法語 boue *參見 buoy

【引伸】
buoy.antly
adv.（副詞）