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These two conditions are realized by human practical activity.
而这两个条件又是通过人的实践活动实现的。
youdao
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These conditions are different in different design of practical produce.
对于实际生产中的每一次设计来说，这些条件是有差异的。
youdao
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These conditions are different in different design of practical produce.
对于实际生产中的每一次设计来说，这些条件是有差异的。
youdao