externalityn.外表；外在性；外部的事物；外部因素externaladj.外来的；外部的；外面的；表面的n.外观；外部；外界事物external acoustic pore外耳门external opportunities外部机会external control model外部控制模式external rectus muscle外直肌external casing packer管外封隔器external wrapped steel外包钢external microorganism外源微生物externally heated oven外加热炉external arcuate fiber外弓状纤维external trigger input外触发输入