现在估计地球上大约一半的生物生活在地下深度约5千米以下的地方。
Current estimates suggest that half of all the living matter on Earth lives underground, at depths of up to 5km.
有时，能见度下降到1千米以下，引发了严重的交通阻塞，航班延误和公路关闭。
Sometimes visibility drops to less than 1 kilometer, causing serious traffic jams, flight delays and highway closures.
有时，能见度下降到1千米以下，引发了严重的交通阻塞，航班延误和公路关闭。
Sometimes visibility drops to less than 1 kilometer, causing serious trafficjams, flight delays and highway closures.
所有这一切活动都发生在据海平面仅34千米以下的地方，所以海床剧烈地向上猛推，引起惊涛骇浪。
With all the action taking place only 24km down, the seabed was thrust violently upwards, triggering huge waves.
并且，石油工业已经开发出可用于海底管道挖槽的遥控船，可以经过改造用来切割矿石，即使这些矿石在1.5千米以下也没问题。
The oil industry has also developed remotely-operated vehicles to make trenches for seabed pipelines, which can be adapted for cutting ore, even though it may lie much deeper, at, say, 1.5km down.
得挖到地表以下2千米的地方才能找到石油。
To reach the petrol sometimes you need to dig something like 2 km below the surface.
得挖到地表以下2千米的地方才能找到石油。
To reach the petrol sometimes you need to dig something like 2 km below the surface.
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