Mr Lemmens said that future spacecraft "should be designed in such a way that they can take themselves out of orbit safely, preferably by doing controlled re-entries".
这样做，比单纯过度偏向一个平台，要安全得多。
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Here’s a proof of concept for augmented assignment.
聚焦党和国家中心任务履职尽责，以高质量协商建言服务高质量发展实践