单词：porous skin
porous skin的用法和样例：
例句
- The entire vehicle is covered with a stiffened skin.整个飞行器包上了钢性蒙皮。
- So, a crack in a titanium spar can be detected under a layer of aluminum skin.因此，它可以探测纵梁蒙皮中钛金属材料以下的铝材裂纹。
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no skin off my nose to save one's skin 我们已经讲过一些和身体各部份有关的习惯用语，如：头，背，眼睛，手臂等。我们也讲过和皮肤有关的俗语。今天我们再给
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