Software is not mass produced.
软件不是大批量生产。
Also, because of their high cost, these test devices are not mass produced.
此外由于成本高，这些测试设备不是批量生产。
The closed system allows energy to transfer through the boundary but not mass.
闭系允许能量通过它的边界传递，但质量不行。
The closed system allows energy to transfer through the boundary but not mass.
闭系允许能量通过它的边界传递，但质量不行。
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