再来几句实用的口语吧~~

2. I am writing to follow up on our earlier decision on the marketing campaign in Q2.
我写信来追踪我们之前对于第二季度营销活动的决定。

3. With reference to our telephone conversation today…
关于我们今天在电话中的谈话...

4. In my previous e-mail on October 5…
先前在10月5日所写的信…

5. As I mentioned earlier about…
如我先前所提及关于