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So in the production of rockery greatly decrease the time and energy cost savings.
这样的话在制作假山时大大减少了时间与精力也节约了成本。
youdao
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The decrease in unit manufacturing cost that is due to mass production.
由于大规模生产，所以单位成本降低了。
youdao
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The decrease in unit manufacturing cost that is due to mass production.
由于大规模生产，所以单位成本降低了。
youdao