您要查找的是不是：
- valve helment mask 活门头兜面具
- He wore a mask so that no one should recognize him. 他戴了一个面罩，使别人认不出他来。
- Have you turned off the water valve? 你关掉水阀了吗？
- Sham is sham and the mask must be stripped off. 假的就是假的，伪装应当剥去。
- He tried to mask his disappointment with a smile. 他试图以微笑来掩饰他的失望。
- The mask fitted tightly over his face. 他用面具把脸蒙得严严的。
- They did so under the mask of charity. 他们是打着慈善的幌子这么做的。
- We need an eye bolt to fit this valve. 我们需要一个有眼螺栓来固定这个阀门。
- He soon detected the faulty valve. 他很快查到了出毛病的阀门。
- Such feelings tend to remain submerge beneath a mask of social politeness. 在社交礼貌的掩盖下，这样的情感往往不会显露出来。
- Her sociable manner is really a mask for a very shy nature. 她那好交际的作风，实际上是她腼腆天性的伪装。
- For a moment his mask of benevolence fell and the real man was revealed. 一刹那间，他慈善的假面扔掉，露出了他的真面目。
- A base, ungenerous wretch who under the mask of friendship has undone me. 有个卑鄙、吝啬的家伙打着友谊的幌子把我毁了。
- A mask, in the character of an old woman, joined them. 一个戴着假面具扮演老妇的人加入了他们的行列。
- The pump sucks air out (of the vessel) through this valve. 这台泵通过这个阀门把(容器中的)空气抽出。
- He preserved his mask of solemnity even with acquaintances. 他甚至和熟人交往也保持着一本正经的面孔。
- He conceals his worries behind a mask of nonchalance. 他装作若无其事，藉以掩饰内心的不安。
- The exhaust valve on my car have burn out three times. 我车子上的排气阀已烧坏三次。
- An oxygen mask will come down from overhead in case of an emergency. 若发生紧急情况，头顶上会降下一只氧气面罩。
- The exhaust valve on my car has burnt out three times. 我车子上的排气阀已烧坏三次。
