tummy-button

例句：

1. 1.She put the button on her shirt to keep it from falling off.
   她把按钮放在衬衫上，以防它掉下去。
2. 2.The chef used a tummy-button to open the door.
   厨师用一个腹部按钮打开了门。
3. 3.The child was so excited that he kept touching his tummy-button.
   那个孩子太兴奋了，他不停地摸着他的腹部按钮。