nip at

例句：

1. 1. The cat nipsat the mouse every time it comes near.
   每当老鼠靠近时，猫都会轻推它。
2. 2. The dog nipped at theball as it ran around the yard.
   狗在院子里追逐球时轻咬了它。
3. 3. The baby nips at hismother's finger with curiosity.
   宝宝好奇地轻推他的妈妈的手指。