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1. The Rh blood group system is used to identify the presence of Rh antigens in a person'sblood.
Rh血型系统用于识别一个人血液中是否存在Rh抗原。
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2. In some countries, it is mandatory for pregnant women to undergo an Rh blood group test before givingbirth.
在一些国家，孕妇在分娩前必须接受Rh血型测试。
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3. The Rh blood group system has been found to be associated with certain medical conditions.
研究发现，Rh血型系统与某些疾病有关。