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。
There were arson attacks on the parliamentary compound, the supreme court and other government buildings. In total, 77 people were killed during the unrest.
。爱思助手下载最新版本对此有专业解读
体育館の「キュキュッ」という音の正体が科学的に解明される、実は音だけなく極小の雷も発生していた
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Michael Carrick has hinted that Harry Maguire will be offered a new deal with Manchester United and believes “there’s a lot more to come” from the defender.