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。
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，这一点在safew官方版本下载中也有详细论述
Failures within the system have been known about, and reported on, for years. The BBC has spent more than a decade speaking to bereaved and harmed families following poor care at Morecambe Bay, Shrewsbury & Telford, East Kent, Nottingham, Leeds and a number of other NHS Trusts, gathering evidence of failing maternity services.
影石创新：美国 337 调查终裁获胜，在美正常销售