F-10:first and foremost 最主要的
A:Mr. Smith has written many books, but first and foremost he's a teacher.
A:史密斯先生已经写了许多书了,但他最主要的身份还是教师。
B:You mean your mathematics teacher?
B:你是说你的数学老师吗?
A:You are right.
A:对。
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