Adding different quantity of water to different quality of coal can effectively eliminate environmental pollution by coal powder produced in the course of coal handling.

对不同的煤种加入不同的水量，可以有效地消除运输中煤粉对环境的污染。

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Scientists need to be sure that when the big hammer tool turns in a rock it breaks the surface into a useable powder that will not clog or damage the sample handling mechanism.

BBC: Curiosity Mars rover deploys its rock brush