名词短语
中文翻译：内层信封
同义词：
['inner envelope', 'rotor side', 'flank例句：1. The inner envelope of the package was damaged during transportation.（包装的内层在运输过程中受损。）']
例句：
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1. The inner envelope of the package was damaged during transportation.
包装的内层在运输过程中受损。
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2. The rotor side is where the blades are attached to the shaft.
转子侧是叶片附着到轴的地方。
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3.The engineer carefully inspected the flank for signs of wear and tear.
工程师仔细检查了侧缘，寻找磨损的迹象。