Eacapement
擒纵系统
🗣️ 情景例句
because we have a little surprise for you today.
因为今天我们要给各位一项惊喜。
When did I say that?
我什么时候说过了？
The development of such a telescope will be one of the great astronomical projects of the twenty-first century.
而开发这样一台望远镜将会是21世纪天文学的一个重要的研究课题。