valid argument

例句：

1. 1. The lawyer's argument was valid; the judge agreed.
   律师的论点是有效的，法官同意了。
2. 2. The scientist presented a valid argument for why climate change is real.
   科学家提出了一个有说服力的理由，说明气候变化是真实的。
3. 3. The teacher asked the students to present a valid argument for their homework project.
   老师要求学生们提出一个有说服力的作业项目理由。