萨姆正在做一些关于古代丝绸之路的研究。

Sam is doing some research about the ancient Silk Road.

youdao

李先生，你能告诉我古代丝绸之路是什么时候开始的吗？

Mr Li, could you please tell me when the ancient Silk Road started?

youdao

龙舟赛多久举行一次？古代丝绸之路是什么时候开始的？那里的中国画多少钱？

How often is the dragon boat race held? When did the ancient Silk Road start? How much is the Chinese painting there?

youdao