在文中也提到这四种形式分别是与镉相结合（cadmium-bound）, 与锌相结合（zinc-bound）, 不含金属（metal-free）和与醋酸盐相结合（acetate-bound）的。
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电流在不含金属矿物的地层介质内经过。
A current is passed through earth materials not containing metallic minerals.
至少部分基本上不含沥青质且不含金属的馏出馏分被转化成供氢体稀释剂。
At least some of the substantially asphaltene-free, and metal-free distillate fraction is converted to a hydrogen donor diluent.
非金属材料是指如木头，塑料，橡胶，环氧树脂，陶瓷及金刚石等那些不含有金属基材的材料。
Nonmetallic materials are those materials such as woods, plastics, rubbers, epoxy resins, ceramics and diamonds that do not have a metallic base.
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