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1.amateur astronomers 业余天文学家
例句:I would again encourage all interested amateur astronomers to new attempts in this direction.
我要鼓励所有感兴趣的业余天文学家在这方面做出新尝试。
2.take place 发生；举行
例句:Elections were postponed the day before polling was due to take place.
在预定进行投票的前一天选举被延期。
3.at the time 那时；当时
例句:I was not in Britain at the time.
当时我不在英国。
4.set out 出发；开始
例句:When setting out on a long walk, always wear suitable boots.
每次出发远行，都要穿合适的鞋子。
