Koopmans
(koopman 的复数) [人名] 库普曼
🗣️ 情景例句
if it's all right with your dad.
假如你爸爸答应的话。
No, I don't. Will it be a problem?
不，我没有，会有困难吗？
it requires 97 per cent less energy to travel the quarter of a million miles from the Moon to Earth-orbit than the 200 mile-journey from Earth's surface into orbit!
因此，从月球到地球的25万英里所消耗的能量要比从地球表面进入地球轨道的200英里所耗能量少97%。