Saccus omphaloentericus
[医] 卵黄囊
🧩 词语组成解析
囊
🗣️ 情景例句
Bob speaking.
我就是鲍勃。
No longer pipe, no longer dance.
运不逢时，事不得意。
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%。