An aquifer is a water - bearing rock stratum such as sandstone and chalk.地下蓄水层是一些有水的岩石层,如沙岩和白垩岩.The coal is a coal resource that reserves in old stratum.石煤是贮藏在古老地层中的一种煤炭资源.A portion of bedrock or other stratum protruding...
Lake Erie is filling with the heavy rain.由于大雨,伊利湖水正在上涨.Mining would pollute the lake and denude the forest.采矿会污染湖水，毁掉森林。...the fever-haunted old town on the lowland across the lake.湖对面低地上那个备受热病困扰的老镇The lake usually ices ...
There are no fortresses that Bolsheviks cannot capture.布尔什维克是无坚不摧的.The French constructed a series of fortresses from Dunkirk on the Channel coast to Douai.法国人在从敦克尔刻到杜埃的英吉利海峡沿岸修筑了一系列要塞。They will establish impregnable for...