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。
"If I get disappointed, I get disappointed really hard - so I actually do this thing where I'll look at who I'm up against and decide, 'OK, I'm rooting for them instead'."
最终，我没有投诉爽约的车主。我愿意相信，每位临时变卦的车主，都有身不由己的理由。但我在顺风车App的“意见反馈”板块，认真写下了自己的“囧途”遭遇，还提了两个小建议：一是平台应健全实际载客人数披露机制，接单前提前告知乘客；二是优化爽约约束，对短期内多次取消订单的车主限制接单权限。，更多细节参见同城约会
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The first thing a multi-tasking operating system needs from hardware is isolation: multiple programs must share one processor without being able to read, write, or jump into each other's memory. The 80386 achieves this through memory protection -- two independent address translation layers.，更多细节参见im钱包官方下载