由于这种抗原很少出现，因此它不可能是由于人类血液中遗传变异形成的抗原。
Since it occurred only rarely, it was unlikely to be an antigen caused by genetic variation in human blood.
开口的大小差异形成了房屋前后的风压差，由此促进了房子的自然通风。
The difference in opening sizes creates a pressure differential across the house that promotes natural ventilation.
从它们感应器件和测值原理的不同、观测时间的差异、天气条件的影响等方面，分析了观测记录差异形成的原因。
The cause analysis of the observation difference is made from their difference in sensor pieces and detecting principle, observation time, weather condition etc.
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