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。
Venus will be the brighter of the pair, dominating the sky at magnitude –4. Saturn will be fainter, at about magnitude 0.6, and will take a little longer to be visible as the sky darkens. It lies slightly higher and to the east of Venus. Unlike stars, both planets will shine steadily, without twinkling.
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DJI Osmo Mobile 8 review: A phone gimbal for content creators on a budget
64-bit type instead of the true C semantic type (int/unsigned int). That
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