非洲疟蚊通过我们富含二氧化碳的呼出物找到我们，它们不叮咬我们的头部，转而去叮咬我们的脚，显然那儿才是它们觅食的最佳场所。
African Anopheles mosquitoes find us by our carbon-dioxide-rich exhalation. But when they get close they turn away from our heads and dive for our feet-apparently their preferred snack spot.
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.
宇航员呼出的二氧化碳被吸走了。
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