If the moisture content of molding sand with low sand, more very dry bulk and hard brittle.
混砂时如果型砂的含水量较低，更回显得相当干散和硬脆。
The more hard material made up more difficult, and sand on equipment wear the more serious.
越硬的物料制砂起来越困难，而且对设备的磨损越严重。
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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