It's hard to walk on the soft sand.
沙土地暄，不好走。
The others agreed and they all began to dig hard in the sand.
别的孩于同意了，他们就都起劲地挖起沙来。
In the Central Arabian desert there is deep sand as well as hard terrain.
在中央的阿拉伯沙漠中，有深沙以及硬地形。
Surface condition: The surface is relatively hard with sand and small rocks.
路面状况：路面地基较硬，多沙石。
It made it more slippery with the sand on top of the hard surface.
由于赛道表面有很多沙子，显得比较滑。
It made it more slippery with the sand on top of the hard surface.
由于赛道表面有很多沙子，显得比较滑。
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