| 1. | The fragile land quickly lost its topsoil and became nothing but sand and dust .
那单薄的土地很快就失去了表土，成为沙粒和尘埃。
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| 2. | Under flood conditions, great amounts of topsoil are washed to receiving streams .
在洪水泛滥时，大量表层土壤被冲刷到承受的水流中。
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| 3. | In many countries the loss of productive topsoil has contributed to growing food deficits .
在许多国家里，生产性表土的流失已导致日益严重的粮食短缺。
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| 4. | If the topsoil is taken away by erosion, plants can no longer grow in the soil left behind .
如果因水土流失而冲掉了表土，植物不能再在留下的土壤中生长。
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| 5. | Loess is easy borne by the wind and may be carried long distances before it falls to earth and becomes topsoil .
黄土易被风刮起并带至远处方才落下成为表土层。
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| 6. | When the black topsoil was all washed away, farmers moved westward and started new plantations .
当表层黑土全部被冲走之后，农民们就向西部转移，建立新的种植园。
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| 7. | It would appear that the inputs are insufficient to offset the mobilization and leaching of calcium from the topsoil .
钙的转入量看来不足以补偿从表土中活化和淋失的钙。
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| 8. | Thus the farmer is helping nature rebuild the topsoil that holds the rain, resists the wind and provides food for growing plants .
因此，农民是协助大自然重建能够存蓄雨水、抵抗风力和滋养各种植物的表面土壤。
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| 9. | Magnetic characteristics of xuzhou urban topsoils
徐州城市表层土壤的磁学特征
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| 10. | Magnetic response of metals in xuzhou urban topsoil
徐州城市表层土壤中金属元素的磁学响应
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