能帮我简要翻译并解析一下这道题么?
Asoneoftheyoungestprofessorsintheuniversity,Mr.Browniscertainlyonthe________ofabrilli...
As one of the youngest professors in the university, Mr. Brown is certainly on the ________ of a brilliant career.
A. porch B. edge C. course D. threshold 展开
A. porch B. edge C. course D. threshold 展开
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