自然界中可能不存在纯铱，通常和其它贵金属共生于天然合金中。
Iridium probably does not occur uncombined in nature but it is found in natural alloys with other noble metals.
锌、铜金属互化物是罕见的天然合金矿物，由锌、铜两种元素组成。
Zinc copper intermetallic compounds are the rare native alloy minerals composed of zinc and copper elements.
自然界中可能不存在纯铱，通常和其它贵金属共生于天然合金中(化学活性不活跃或迟钝)。
It probably does not occur uncombined in nature But is found in natural alloys with other noble (i. e., chemically inactive or inert) metals.
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