Hb.
abbr．血红蛋白（Hemoglobin）：一种存在于红细胞中的铁蛋白，负责携带氧气从肺部输送到身体各部位，并将二氧化碳从身体各部位输送回肺部。
例句
Nothing has ever taken to the air like HB-SIA, as the Swiss aircraft is known.
从来没有一架飞机像这架叫做 HB-SIA 的瑞士飞机那样子飞行过。
Although it has a wingspan of 61 meters, HB-SIA has room only for a pilot.
尽管 HB-SIA 的翼幅有61米，其空间却只能容纳一个飞行员。
The plan is for HB-SIA to give demonstration flights during the show, subject, of course, to the weather.
计划是在展览期间，HB-SIA 进行试飞，当然得视天气状况而定。
