Quadrode
n. 四极管
🗣️ 情景例句
Atta girl!
好女孩！
The school is two miles straight ahead.
那学校一直向前两英里。
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%。