我们的讨论涵盖了各种话题，例如气候变化和核武器。
Our discussion ranged over various ___topics, such as climate change and nuclear weapons.
食物是我最喜欢的话题之一。
Food is one of my favourite ___topics of conversation.
会议的主要议题是未来计划。
The main ___topic of the meeting was future plans.
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