It is necessary to "cutone'steeth" on the non-glamorous parts of a field.
在一个领域中尝试做一些不那么光彩照人的工作来获得经验是有必要的。
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Also, it is necessary to "cutone'steeth" on the non-glamorous parts of a field before one really has any chance at all to tackle the famous problems in the area;