Zelling
零长导轨发射
🗣️ 情景例句
Please cash this check.
请兑现这张支票。
Work has a bitter root but sweet fruit.
劳动根虽苦，然而果实甜。
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%。