如果没有重力帮助空气循环，你呼出的二氧化碳会在你头顶周围形成一个看不见的云状物。
Without gravity to help circulate air, the carbon dioxide you exhale has a tendency to form an invisible cloud around your head.
XZ系列离心机是一种上悬式重力卸料、自动控制、连续循环工作过滤离心机。
XZ Series are a kind of top-suspended self-discharge filtering centrifuge with automatic control and continuous operation.
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