练习六
Directions: Read the underlined sentences carefully, and then translate them into Chinese. You may check your answers after you finish them.
Passage One
Water on the earth is being recycled continuously in a process known as the hydrologic (水) cycle. The first step of the cycle is the evaporation of water in the oceans. Evaporation is the process of water turning into vapor, which then forms clouds in the sky. The second step is the water returning to the earth in the form of precipitation :either rain, snow or ice. When the water returning to the earths surface, it runs off into the rivers, lakes, and the ocean, where the cycle begins again.
Not all water, however, stays on the surface of the earth in the hydrologic(水)cycle. Some of it sinks slowly into the ground through infiltration and collects under the earths surface as groundwater. This groundwater is extremely important to life on earth, since 95 percent of the earths water is in the oceans and is too salty for human beings or plants. Of the 5 percent on land, only .05 percent is above ground in rivers or lakes. The rest is underground water. This underground water is plentiful and dependable, because it doesnt depend on seasonal rain or snow. It is the major source of water for many cities. But as the population increases and the need for water also increases, the groundwater in some areas is getting dangerously low. Added to this problem is an increasing amount of pollution that seeps into the groundwater. In the future, with a growing population and more poisonous waste, the hydrologic cycle we depend on could become dangerously unbalanced.
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