名词
中文翻译：扣子
同义词：
['button', 'buttonhole', 'fastener']
例句：
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1. She carefully buttoned up her coatto keep warm.
她小心翼翼地扣上外套以保暖。
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2. The buttons on his shirt were allmissing.
他衬衫上的纽扣都掉了。
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3. Hetried to fix the buttonhole in hisshirt but couldn't find it.
他试图在衬衫上修复纽扣，但找不到了。