Learning program
[计] 学习程序
🧩 词语组成解析
🗣️ 情景例句
Good morning.
早安。
Any questions?
有什么问题吗？
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%。