These rovers can drive over rocks and all kinds of rough ground.
这些探测器可以在岩石和各种粗糙的地面上行驶。
Before sowing or planting crops, rough ground must be cleaned and weeds removed.
在播种或种庄稼之前，必须将土地清理平整并将杂草铲除。
He learnt how to clean rough ground before planting crops.
他学会了在种植作物之前如何拾掇毛糙的土地。
He learnt how to clean rough ground before planting crops.
他学会了在种植作物之前如何拾掇毛糙的土地。
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