名词
中文翻译：自然下垂
同义词：
['natural dip', 'natural sagging', 'natural sagging']
例句：
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1.The fabric has a natural sag in the waist area.
这件衣服在腰部有自然的下垂。
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2. The chair had a natural sag in the back, making it uncomfortable to sit on.
椅子后部有自然的下陷，坐上去不舒服。
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3.The old tree had a natural sag in its trunk, which made it difficult to climb.
这棵老树的树干有自然的下陷，爬起来很困难。