seal: n.〔sing., pl.〕【动物；动物学】1.海豹。2.海豹毛皮(制品)。3.海豹皮色〔灰黄深褐色〕。4.〔Seals〕〔美国〕海豹突击队〔美国的一支海陆空军突击队〕 the common [harbor] seal (斑纹)海豹。短语和例子the fur seal 腽肭兽，海狗。vi.猎海豹。n.1.(打在火漆，铅等上的)火漆封印；封蜡；封铅；封条。2.捺印；封缄。3.
The seals of tubing spool and tubing hanger are classified as two types : vertical rubber seal and tapper metal seal . users can select one of them upon their requirement 油管四通和油管悬挂器分两种密封结构形式，一种是直座式橡胶密封，一种是锥座式金属硬密封，可根据不同需要确定其选用形式。
