There are 15 million of us who fly across multiple time zones every year, with 500, 000 of us in the air at any given moment.
每年都有1500万人乘坐飞机跨越不同时区，甚至每时每刻都有50万人在天上。
There are three such zones in the us-east region at this time: us-east-1a, us-east-1b, and us-east-1c.
此时，在 us-east 地区有 3 个这样的区域：us-east-1a、us-east-1b 和 us-east-1c。
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