最令航天业担忧的是钇供应紧张。钇是高温防护涂层中的关键成分，可防止发动机和涡轮在高温下“熔化”，一旦无法定期施涂相关涂层，发动机便无法正常服役。
圖像來源，SCREENSHOT
Readers respond to articles by Gaby Hinsliff and Sumaiya Motara on the availability of first jobs, and the hoops applicants are made to jump through，详情可参考同城约会
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The Natterer's come out a little later, preferring to exit through small holes in the roof to get outside and find food.
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