two poleadj.两极的twonum.二；两个Two-fluid momentum equation双流体力学two-core-per-bit system每位二磁心系统two-dimensional map symbols2维地图符号Two animals of one species.同一种类的两个动物two-step chemical procedure两步法Two - headed coupling model双头耦合模型two-stage cascade generator双级级联起电机two-stage contact oxidation二级接触氧化two-stage mass spectrometer双级质谱计two-stage reactor fixed bed二级固定床