Pentavalency
五价
🗣️ 情景例句
Well, it's all part of the same job.
嗯 它们都是同一项工作的一部份。
And trade terminology in English is helpful in actual business negotiations.
对于实际的商务谈判是非常有用的。
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%。