名词
中文翻译：Unknown
同义词：
['subordinate fold', 'secondary crease', 'secondary folding']
例句：
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1. The book has a secondary foldin the center.
这本书中间有一个次级褶皱。
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2. The fabric has several secondary folds that make it more comfortable to wear.
这件衣服有几个次级褶皱，穿起来更舒适。
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3. The paper was foldedinto a secondary fold for easy storage.
这张纸被折叠成次级褶皱以便容易存放。