be strict in没有这个用法噢.
be strict about/on sth：对某事严格.
be strict with sb：对某人严格.
有 be strict in sth,be strict with sb/sth,be strict about sth.其它的没有.都是严格的意思 .
My teacher is always strict with us.
我的老师对我们总是很严格.
We must be strict about this problem.
我们必须严肃对待这个问题.