9 在过去大约50年的时间里,科学家已经能够观察到越来越远的太空了.
In the past fifty years or so,scientists have been able to observe farther and farther into the sky.
observe用于“观察”
10 这孩子上周吧所有的五支铅笔全丢掉了.
The child lost all his five pencils last week.