blood type

A blood type (also called a blood group) is a classification of blood based on the presence and absence of antibodies and also based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs).

These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system. Some of these antigens are also present on the surface of other types of cells of various tissues. 这些抗原可能是蛋白质、碳水化合物、糖蛋白或糖脂，具体取决于血型系统。其中一些抗原也存在于各种组织的其他类型细胞的表面。

A total of 35 human blood group systems are now recognized by the International Society of Blood Transfusion (ISBT). The two most important ones are ABO and the RhD antigen; they determine someone's blood type (A, B, AB and O, with +, − or Null denoting RhD status). 国际输血学会（ISBT）目前共认可35种人类血型系统。最重要的两个是ABO和RhD抗原；他们确定某人的血型（A、B、AB和O，带+，− 或表示RhD状态的Null）。

A Study in Scarlet is the first Sherlock Holmes novel written by Arthur Conan Doyle first published in 1887. Dr John H. Watson meets the great detective Sherlock Holmes and together they solve a case of murder, in which Watson is amazed at Holmes' "science of deduction".

记得很早以前看到过“福尔摩斯探案集中的硬伤”，可是现在搜不到完整的了。列两条：
1. 阿富汗是热带地区吗？
https://literature.stackexchange.com/questions/11899/was-afghanistan-considered-tropical-or-was-holmes-wrong
He has just come from the tropics, for his face is dark, and that is not the natural tint of his skin ... Where in the tropics could an English army doctor have seen much hardship and got his arm wounded? Clearly in Afghanistan... You originally posted this question on the Earth Sciences site, and you seem to have been thinking of this quote with a literal (I'd even say pedantic, noting that I consider this a compliment) interpretation of the word "tropics". But in everyday English, the word isn't always used so precisely - I'd wager most English people aren't aware even today that the tropics refers specifically to the region between 23°N and 23°S, and that was probably even more true in the days of the British Empire when people travelled less and knew less about the world beyond their own country.

2. “现在把鲜血滴进一公升的水里，您看，混合之后的液体跟清水几乎一样，至少用肉眼是看不出来的。血在溶液中占的比例还不到百万分之一。”
临床上常用滴管的规格在滴管上都有显示，有9cm和10cm的两种，20滴加在一起是1ml，所以平均一滴是0.05ml。0.05/(0.05+1000)约等于五十万分之一。血液的比重为1.050～1.060，血浆的比重约为1.025～1.030，比水略重一点点。

《老友记》里Joey以为去佛蒙特州要把美元换成Vermont Money。另一个故事：美国人地理知识有多差？本国公民被当成外国友人 - 知乎 

标签：even,group,tropics,blood,type,was,RhD
来源： https://www.cnblogs.com/funwithwords/p/15904342.html