名词
中文翻译：外部覆盖物
同义词：
['outer layer', 'outer covering', 'outer skin']
例句：
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1. The clothes were washed and dried on the line.
衣服被晾晒在绳子上。
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2. The new coat is made of a warm material that keeps you dry in cold weather.
这件新外套是用一种保暖的材料制成的，可以在寒冷的天气里保持你干燥。
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3. The outer layer of the skin protects it from harmful bacteria and viruses.
皮肤的外层保护它免受有害细菌和病毒的伤害。