英語翻譯：

float; on the surface; unstable
【化】 flotation

相關詞條：

1.airbladder  2.swimmingbladder  3.flotation  

例句：

1. 浮冰對這一帶的航運是一種威脅。
   Ice-floes are a threat to shipping in the area.
2. 注意你的浮子！
   Pay attention to your float!
3. 魚浮到水面上捕捉昆蟲。
   Fish were surfacing to catch insects.
4. 氣囊水生動植物器官中用來幫助飄浮用的充滿氣體的囊或結構
   An air-filled sac or structure that aids in the flotation of an aquatic organism.
5. 水不夠深，船浮不起來。
   There wasn't enough water to float the ship.