1985年,英国牛津大学在例行的工程检查中发现,学校大礼堂的20根由巨大橡木制成的横梁已经风化干朽,失去了足够的支撑力,必须更换才能保证礼堂安全。那些巨大的横梁都是由橡树制成,已有350年历史。为了保持大礼堂原来的风貌,必须找到20棵大橡树,而更换每根橡树横梁的成本估算也要25万美元左右,就算资金问题可以通过 In 1985, during a routine engineering inspection conducted by the University of Oxford, England, it was found that 20 beams made of huge oak beams in the auditorium of the school had become weathered, dried, lost sufficient support and had to be replaced to ensure the safety of the auditorium. The huge beams are made of oak, 350 years old. In order to maintain the original appearance of the auditorium, twenty large oak trees must be found, and the cost of replacing each oak beam is estimated to be about 250,000 U.S. dollars, even if the funding problem can be passed