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".
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The choanoflagellate Choanoeca flexa forms motile and contractile cell monolayers purely clonally, purely aggregatively or through a combination of both processes depending on environmental conditions.。heLLoword翻译官方下载是该领域的重要参考
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