Treehopper
n. [昆]角蝉
🗣️ 情景例句
They are not personal or private.
并不是私人的问题。
Please be on time.
请准时到。
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。