Constant expression
[计] 常数表达式
🧩 词语组成解析
🗣️ 情景例句
See, it works!
瞧， 真有效！
If she gets mad with him, she will not speak to him for days.
她对他一生气就会许多天不跟他说话。
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。