词根是study，(v，学习)中文意思是n. 学生学者

She knows every student in the school.

她认识学校里的每一个学生。

Mark is the best candidate for chairman of the student union， isn't he?

马克是学生会主席的最佳人选，不是吗

I'm convinced I'm the best candidate for the chairman of the Student Union.