Ij
abbr. 长城航空二字代码
🗣️ 情景例句
555-9470…and it's busy….
555-9470……还是忙音 ……
What do you mean by that?
你这话是什么意思？
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%。