给出满足主右理想极小条件诣零环的两个充要条件，此类环是扩张闭的。

This peper gives two necessary and sufficient conditions for a ring to be a nil MHR-ring. It is obtained that any nil MHR-ring is extension closed.

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最后，产品通过零售环节流通到消费者手中，产品通常在这一环节中再还原为单个产品。

Finally, the flow of products through the retail chain to consumers, the product is usually further back in the chain for individual products.

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该计算机使用的包装盒十分环保，25 ％为可回收纸板，10 ％的塑料可回收，电脑零件的 95 ％都易于回收。

The computer is packed in a box made of 25% recycled cardboard, its plastic is at least 10% recycled, and 95% of its components are designed for easy recycling.

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