sucking reflex

例句：

1. 1.The baby's sucking reflex is very strong.
   婴儿的吮吸反射非常强。
2. 2. Scientists are studying the effects of stress on the sucking reflex.
   科学家们正在研究压力对吮吸反射的影响。
3. 3. The child was so engrossed in his book that he didn't realize he had stopped sucking.
   孩子被书迷住了，以至于他没有意识到他已经停止了吮吸。