prean甲基眠尔通PREabbr.Petroleum Refining Engineer炼油工程师preclassical period前古典时期pre and post events之前的和之后的项目predisposing factor诱病因素Pre-Caspian Basin滨里海盆地pre-acidification预酸化pre emphasis factor预加重系数predetermined level预定电平pre-remove copper预除铜premonitory symptom先兆症状,前驱症状preterminal protein(腺病毒)前末端蛋白