单: singular number fate; destin ...缺: be short of; lack单缺士: single adviser guard单缺口接头: single cogging单缺口斜接头: single skew notch; single stejoint单缺圆折流板: side-to-side baffles单裙边绝缘子: single shell insulator单裙绝缘子: bell insulator单裙绝缘子 铃形绝缘子: bellinsulator单全异株的: trioecious单群: one-group; simple group; single group单全异株: trioecy
