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黑核桃的壳相当硬，因此必须使用特殊的碎裂机。
Black walnut shells are so hard they require special crackers.
youdao
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动平衡机分软支承和硬支撑两种。
Two kinds of soft support and hard support for dynamic balancing machine.
youdao
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动平衡机分软支承和硬支撑两种。
Two kinds of soft support and hard support for dynamic balancing machine.
youdao