Baoding
保定[河北省](舊譯Paoting)
??? 情景例句
We used to catch crabs.
我們以前常捉螃蟹。
Excuse me for interrupting.
對不起打擾你了。
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，從月球到地球的25萬英里所消耗的能量要比從地球表面進(jìn)入地球軌道的200英里所耗能量少97%。