你最好不要说我不适应你的口音……
这样人家会觉得不舒服的。谁都不喜欢别人说自己口音重。
让他说慢点就好了。
说法一:
Could you please speak slower? I can't follow you.
你能说慢点吗?我跟不上你。
说法二:
Could you slow down a little bit, please. I couldn't catch you.
你说话速度可以放慢些吗?我跟不上。
你可以说,I can't follow you.(就是我不能理解你说的话,然后让他说慢点。)