a loop for fastening a button
扣扣环系纽扣的环
以上为机器翻译结果，长、整句建议使用 人工翻译 。
A frog (sometimes referred to as a Chinese frog) is an ornamental braiding for fastening the front of a garment that consists of a button and a loop through which it passes.
盘扣是一种装饰性的编织状扣子，用来扣住一件衣服的前襟。
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