您要查找的是不是：
- They did so under the mask of charity. 他们是打着慈善的幌子这么做的。
- 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。
- 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。
- When did the first measurement of the speed of sound take? 第一次测量声速是在什么时候？
- 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。
- Every paragraph is a distillation of sound judgment. 每段话都是正确判断的结晶。
- We tore from them the mask of democracy. 我们撕下了他们民主的假面具。
- Airliners in service at present cannot fly faster than the speed of sound. 目前供使用的客运机飞行速度不能超过音速。
- Characterized by high volume and intensity. Used of sound. 大声的以高音量和强烈为特征的。用于声音
- The world ut off it mask of vastne to it lover. 世界对着它的爱人，把它浩翰的面具揭下了。
- Mach two equals twice the speed of sound. 二马赫相当于声速的二倍。
- His distinction of sound is excellent. 他辨别声音的能力很强。
- He longed to throw off the mask of respectability. 他渴望丢掉那副道貌岸然的伪装。
- Our teacher has mutation of sounds suddenly. 我们的老师突然语音发生了变化。
- Pride is the mask of one's own faults. 骄傲是人自身错误的面具。
- Wood is a poor conductor of sound. 木头是声音的不良导体。
- 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 cheated me under the mask of friendship. 她借朋友之名欺骗了我。
- A device for measuring the speed of sound in water. 速度计，速度表用于测量声音在水中的速度的仪器
