Debris actually pelts the ISS all the time, and noticeable dents and cracks line the exteriors. But should something fully breach the station, cabin atmosphere will seep into the vacuum of space and alarms will go off. Pressure gauges will confirm to astronauts that the station has, almost certainly, been hit, and the speed of the seepages may indicate how much time the crew has to respond. According to one NASA estimate, a 0.6-centimeter-wide hole leaves 14 hours to plug the leak. A 20-centimeter hole leaves less than a minute.
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俗话说，民以食为天。春节假期，两则关于“吃”的见闻，令人颇为感慨。
学会表达自己的诉求对于小孩子来说还挺难的，所以3岁开始，就注重引导她学会说出自己的诉求。我闺女有点小矫情，想要什么也不说，没满足就是哭。等她哭完，就引导她说出自己的诉求，也告诉她应该怎么表达。
Firm’s automated warehouses are struggling to compete against swift deliveries from stores by bike riders