So, you must be in this case if you have a noninvertible system where the right hand side is zero.
这种情况必然发生在,不可逆线性方程组的情况,且等号右边为零。
I thought there must have been a very good reason to make you go up to Paris like that. You've not left my side for four months.
你已经有四个月没有离开我了,我想你到巴黎去一定有什么重要原因。
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