🗣️ 情景例句
Don't be upset, Malcolm.
别懊恼了 Malcolm。
Please turn in your paper before leaving.
请在离开前将论文交上。
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。