老师点评：
      童昕同学的文章很有趣，同学们在科学馆和一个puzzle较上真了。puzzle这个词有点不明确，要是再多一点描述就更好了。

yesterday we went to the science hall. in the very beginning, i thought it would be very boring. in the hall we found a puzzle that we thought it was easy to put it together. but we were wrong. we tried almost every way while we can’t make it. so we sat on the floor .then a custodian came and asked what we were doing. we told him that we can't put it together. then he sat down and started to help us. to our surprise he didn’t make it either. so we stayed there for almost an hour. but no one can put it in a perfect shape. thus we had to give up. after that, we went to watch the 4d movie. it was about the space and astronauts. it told us why rockets can start up and go to the space. but it was not interesting. the students fell asleep. when we go out we met the custodian again .he told us the answer. we all felt very happy.   

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