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.
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