Doctor: His upper lip has been cut. Several teeth have become loose. One of them has to be ex acted; some others need re-fixing.

医生：上嘴唇破了，有几颗牙松动，其中有一颗需要拔掉，其他的需要固定一下。

youdao

Also, it is necessary to "cut one's teeth" on the non-glamorous parts of a field before one really has any chance at all to tackle the famous problems in the area;

而且，应该先在一个领域中做一些不那么光彩照人的工作，直到有机会和能力之时，再去解决那些重大的难题。

youdao

Also, it is necessary to "cut one's teeth" on the non-glamorous parts of a field before one really has any chance at all to tackle the famous problems in the area;

而且，应该先在一个领域中做一些不那么光彩照人的工作，直到有机会和能力之时，再去解决那些重大的难题。

youdao