Tetrachlorophenol
四氯苯酚
🗣️ 情景例句
I promise not to think about the city.
我保证不再去想城里的事。
Which one is more expensive?
哪一个是比较贵的？
a wave length (the horizontal distance between two wave crests),
波长（两个浪峰间的水平距离）