I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.
我星期五会给你打电话,在你方便的时间重新安装我们的午餐约会。
The Hubble telescope was launched into space by NASA on April 20,1990 at a cost of over a billion dollars.
哈勃望远镜于1990年4月20日由国家航空航天局发射升空,耗资10多亿美元。