在华盛顿的美国宇航局总部的近地天体计划负责人林德利-约翰逊说，如果一颗足球场大小的小行星撞上了地球，其威力可以毁灭一座大型城市。
Lindley Johnson, head of the near-Earth object program at NASA headquarters in Washington, D.C., says an asteroid the size of a football field could wipe out a major city.
在几个足球场大的地方，这些数据中心充满了数千台大型计算机和存储设备，并用高速光纤接入因特网。
The size of several football pitches, these data centres are filled with thousands of powerful computers and storage devices and are hooked up to the internet via fast fibre-optic links.
一个足球场大小的面积可以覆盖在一小时内由两个人同与大型天线线圈加上这些单位之一。
A football field sized area can be covered by two people in an hour with one of these units coup led with the large antenna coil.
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