Iridium (Ir): If iridium sounds familiar, that might be because there’s a group of communications satellites named after this element, a hard, brittle and dense metal.
铱：如果铱听起来让你觉得熟悉，那可能是因为很多通讯卫星都是以这种硬而脆的大密度金属元素命名的，也可能是因为恐龙在白垩纪末从地球灭绝，与铱有关的缘故。
A unit of matter, the smallest unit of an element, having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons.
物质的单位、元素的最小单位，有该元素的全部特征，由中部密集的、带有正电的原子核及绕原子核的一系列电子组成。
In addition, typed arrays are dense, that is, every index in the allowed range refers to an element.
此外，类型化数组是“稠密的”，即在允许的范围内的每个索引都引用一个元素。
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