广播电视英语短句 第 70 课：流失土壤-2

Wind has damaged almost two million square kilometers. 水侵蚀土地接近200万平方公里。

The researchers blamed farming and the clearing of forests for much of the damage. 研究者把大部分损害归咎于农业和砍伐森林。

Rural areas are not the only ones losing soil. Land is also being affected in cities and near mines and factories. 但是农村地区不是流失土地的唯一地区，在城市里、矿场和工厂附近土地也受到影响。

The researchers say that every year, four and one-half billion tons of soil are washed or blown away. 研究者说，每年有45亿吨土壤被水冲走或被风吹走。

At that rate, they say, grain production in northeastern China could decrease forty percent within forty to fifty years. 照这样的速度，40~50年内，中国东北部的粮食产量可能会减少40%。