abbr. Health Insurance Institute 健康保险学会
网络 Human Interface Infrastructure; 英格尔斯工业公司(Huntington Ingalls Industries); 硬件无关接口
Reddish hydrogen emission regions, called HII regions, are the regions of intense star formation seen to lie mainly along M51´s bright spiral arms.
红色的氢发射区域,称为HII区域,是激烈的恒星形成区,主要沿着M51明亮的旋臂可见。
One result is that M101, also called the Pinwheel Galaxy, has several extremely bright star-forming regions (called HII regions) spread across its spiral arms.
其中一个结果就是被称为风车星系的M101内有数个极度明亮的恒星形成区域(也被成为HII区域)分布在星系的旋臂上。