Colum
n. 科勒姆（姓氏）
🗣️ 情景例句
Sam, would you come in, please?
Sam，请进来一下， 好吗？
A work ill done must be twice done.
未做好的活，需要重新做。
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%。