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美国“哥伦比亚”号航天飞机不幸失事，不仅失去了７名航天精英和１架昂贵的航天飞机，也使得在机上进行的８０多项重要科学实验（包括我国中学生设计的“蚕在太空吐丝结茧”的实验）所获数据丧失殆尽，实在令人痛惜。于是有人提出疑问：冒着如此巨大的风险进行太空探索，究竟
The U.S. “Columbia” space shuttle suffered a tragic accident and not only lost seven space elites and an expensive space shuttle, but also made more than 80 important scientific experiments conducted on the plane (including silkworm knots in space designed by our middle school students). It is truly deplorable that the data obtained by the experiment was lost. Some people raised the question: What are the risks involved in space exploration?