名词中文翻译
中文翻译：硬膜
同义词：
['hard skin', 'hard shell']
例句：
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1.The hard film on the surface of the stone is very difficult to remove.
石头表面的硬膜很难去除。
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2. The hard film on the surface of the glass was too thick to be scratched.
玻璃表面的硬膜太厚，无法被刮伤。
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3.The hard film on the surface of the metal prevents it from being easily scratched.
金属表面的硬膜防止它容易被刮伤。