Bitusol
[机] 南美洲特里尼达产天然沥青
🗣️ 情景例句
He had an emergency.
他有紧急事情。
Time and tide waits for no man.
岁月不等人。
One is the general atmosphere of secrecy in which it is carried out,
一是科研工作中普遍存在的保密气氛；