cut a teeth

例句：

1. 1. She was so excited to see her baby teeth come in.
   她看到宝宝长出乳牙时非常兴奋。
2. 2.The baby is starting to cut its first teeth.
   宝宝开始长出第一颗牙齿了。
3. 3.It's time for the little one to start cutting his or her teeth.
   是时候让小家伙开始长牙了。