抱歉，我没听懂。你能再解释一遍吗？

Sorry, I didn't ___follow that. Could you explain it again?

老师讲得太快时，很难跟上讲座的内容。

When the teacher speaks too quickly, it's difficult to ___follow the lecture.

到目前为止，你能理解我的推理吗？

Do you ___follow my reasoning so far?