Definition: a subject that you talk or write about Level: B1
我们的讨论涉及一个关键话题，比如气候变化。
Our discussion ranged over a key ___topic, such as climate change.
首先我们谈论了一个常见话题，比如学校活动。
First we talked about a common ___topic, like school activities.
教授为讲座选择了一个引人入胜的话题。
The professor chose a fascinating ___topic for the lecture.
