Deep underground, in a circular tunnel 16 miles long, is a stream of trillions of tiny particles.
在很深的地下，一条循环的16英里长的地下隧道，有一条几万亿微小的粒子流。
Underground water resources, or oases, sufficient to support irrigated agriculture are found in dry stream beds and depressions.
在干河床和洼地处可找到充足的地下水资源或者绿洲来支持灌溉农业。
Underground water resources, or oases, sufficient to support irrigated agriculture are found in dry stream beds and depressions.
在干河床和洼地处可找到充足的地下水资源或者绿洲来支持灌溉农业。
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