Statunit
釐米克秒静电制单位
🗣️ 情景例句
taking these remarkable pictures
来拍摄这些突出作品
Without practice, hopes will be reduced to zero.
没有实践，希望会化为乌有。
why have we had no visitors from outer space yet?
那么我们为什么还未见到外层空间来访的客人呢？