twogridadj.双栅极的twonum.二；两个two-stage PDC bit双级PDC钻头two-chambersystemn.两院制two-range winding双排绕组,两平面绕组two Guang provinces两广two-fold dilution对倍稀释； 二倍稀释two point threshold两点差别阈two-line GMS line两系不育系two-stage cooling两段式冷却two-mirror system双反射镜系统two-trace recorder双迹录音机