纽扣

例句：

1. 1. The shirt has a small button on the front.
   这件衬衫前面有一个小纽扣。
2. 2. She carefully fastened the button on her coat.
   她小心翼翼地将纽扣系在外套上。
3. 3. He put the button back in place after he finished sewing.
   他缝完衣服后，把纽扣重新放回原位。