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Louie bent down and put his hand into the fine-grained sand at his feet.
路易弯下腰，把一只手放入脚下面的细沙中。
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The sand will be severely shaken and sieved to make sure only fine-grained material, less than the width of a human hair in diameter, reaches the instruments.
BBC: Nasa's Curiosity Mars rover to scoop sand sample
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