In this case, the ring should comprise of a plain metal band (such as gold or platinum), as gemstones and diamonds will not hold up well.
如果他的工作两手都要用到，就给他选一款纯金属戒指(黄金或白金)，宝石或钻石的戒指戴起来会不方便。
This article introduces the working principle, main structure of a kind of Auto-molding Ring-making Machine developed on our own as well as its design and production condition.
介绍了一种自行研制的焊环自动成形机(简称制环机)的工作原理及结构，并着重分析、说明了其主要设计情况。
This article introduces the working principle, main structure of a kind of Auto-molding Ring-making Machine developed on our own as well as its design and production condition.
介绍了一种自行研制的焊环自动成形机(简称制环机)的工作原理及结构，并着重分析、说明了其主要设计情况。
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