🗣️ 情景例句
Yes, but I don't know where to start.
是的 ，但我不知道从何说起。
Excuse me. Could you give me change for a dollar?
劳驾，你能不能换1元零钱给我？
It is the natural frequency of emission of the hydrogen atoms in space and was discovered by us in 1951;
这个频率是空间氢原子释放的自然频率，是在1951年被人类发现的。