🗣️ 情景例句
Any time.
随时效劳。
He that converses not knows nothing.
不和人交谈的人一无所知。
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。