Ecafe
(联合国)亚洲及远东经济委员会
🗣️ 情景例句
How soon will my mail be received by the other end?
我的信件多快能被对方收到？
How long have you studied English?
你学英语多久了？
The currents of air that the walls of the ship direct upwards, as well as in the line of its course, are enough to give the great bird with its immense wings sufficient sustenance and progress.
沿船体的上升的气流和沿航线向前的气流给这种巨翼大鸟以足够的浮力和推力。