Chew on 何解？chew 是及物动词为什么还要加介词on ？ 同理还有check chec

chew既是及物动词也是不及物动词chew on
1.
仔细考虑，反复考虑；深思；细想：
Tom likes to have some difficult matter to chew on.
汤姆喜欢反复思考难题。
2.
反复地咬(或啃)；咀嚼；嚼碎：
Babies who are getting new teeth like to have something hard to chew on.
正在长新牙的婴儿喜欢咬硬东西。
check也是
check on
1.
核对；查清；检查：
You should go to have the doctor check on your health.
你应当去找医生检查一下身体的健康状况。

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