... different racial type s 不同的人种 a rare blood type 罕见的血型 There are three main type s of contract(s). 有三种主要的合同。 ...
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AB型阴性是一种罕见的血型。
因为这两个孩子有同样罕见的血型，约翰尼势必就是理想的输血者了。
Since the two children had the same rare blood type, Johnny would be the ideal donor.
研究人员称具有强有力的语气证明他是“凯尔阳性”，这是一种罕见的血型，会导致严重的健康问题和生殖障碍。
Researchers say there is compelling evidence that he was ‘Kell positive’, a rare blood type which can cause serious health and fertility problems.
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