Some of the problems were mentioned in his report.
其中的一些问题在他的报告里提到了。
(= it is important enough to mention ) that they only studied a very small number of cases.
必须说明的是他们仅研究了几个个案。
As I mentioned earlier , there have been a lot of changes recently.
正如我刚才所说的，最近变化很大。
She mentioned in passing (= mentioned in a quick unimportant way ) that you had just been to Rome.
她只是随口提了一下你刚刚去过罗马。