It probably does not occur uncombined in nature But is found in natural alloys with other noble (i. e., chemically inactive or inert) metals.

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)。

youdao

Reactants in radiopharmaceutical kits, or inactive ingredients that physically or chemically combine with active ingredients to facilitate drug transport are considered inactive ingredients.

放射性药物组成中的反应物，或为了便于药物运输将非活性成分与活性成分以物理或者化学而结合都被认为是非活性成分。

youdao

Reactants in radiopharmaceutical kits, or inactive ingredients that physically or chemically combine with active ingredients to facilitate drug transport are considered inactive ingredients.

放射性药物组成中的反应物，或为了便于药物运输将非活性成分与活性成分以物理或者化学而结合都被认为是非活性成分。

youdao