最后要添加的是 Mobile Safari 用户选择退出手机视图然后选择重新进入的机制。
The last thing to add is a mechanism for Mobile Safari users to opt out of the mobile view and then opt back in.
在重新进入大气层的过程中，大部分航天器会在穿过地球大气层时燃烧殆尽。
During re-entry, most of the spacecraft will burn up while passing through the Earth's atmosphere.
水分子会蒸发，凝结，形成降水，重新进入地球的水循环系统。
The water molecules will eventually evaporate, condense, and recycle back to Earth as precipitation.
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