Pretti普雷蒂PREabbr.Petroleum Refining Engineer炼油工程师preterm low-birth-weight早产低体重儿preorder traversal algorithm先根遍历Premarital health assessment强制婚检prefabricated speech routine例行套语pre-operation radiotherapy术前放射冶疗prelubricated sealed bearing预润滑密封轴承prefabricated dwelling house预制装配式住宅pre-stress concrete brideg预应力混凝土桥梁pre-historical agriculture史前农业precipltation polymerization沉淀聚合