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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They also retain the rough tongue that can help them clean every last morsel from an animal bone (and groom themselves).

它们也仍保留着那粗糙的舌头来帮助它们剔掉动物骨头上最后的一点碎屑，同时也帮助它们自己梳洗毛发。

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Thoroughly clean all metal surfaces of all rust; scale, grease, rough spots and other foreign matter, which may prevent proper paint adhesion.

彻底清除所有金属表面的锈迹，污垢，油脂，糙点，及其他防止油漆附着效果的杂质。

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Rough weather since Hurricane Alex passed through the Gulf, to the south of the spill, has hampered clean-up operations for the last week.

BBC: Gulf oil spill reaches Texas as tar balls wash ashore