如何使用 "topic" 造句

1. It 's a fraught topic lately .
最近这是个令人担忧的话题。
2. Each of those reasons is a topic .
每个原因都是一个主题。
3. How did you first get interested in this topic ?
你第一次是如何对这个课题感兴趣的?
4. It has been a hot topic of conversation .
这是现在大家热议的题目。
5. Cognitive enhancements are a complex topic , but they have aspects that are intrinsically valuable .
认知增强是一个复杂的论题,但在许多方面是自有其价值的。