The Vostok 1orbited the earth once
问题描述:
The Vostok 1orbited the earth once
对once提问
答
Vostok 1号曾经绕地轨道飞行对once提问once曾经adv??once曾经的意思,副词用how many 还是how oftenonce表示一次的话,用how often,问的是频率