Preflysch
前复理层
🗣️ 情景例句
Who wants to begin?
谁先开始？
I can see you have put a lot of time into it.
我相信你在制定这个计划上一定花了不少精力吧。
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%。