excidevt.切去(割掉)EXCn.开挖(激励器；排气关闭)exchanging switches倒闸操作excitatory autacoid激素(内泌素)exciton interaction激子相互作用Excision of fat pad脂肪垫切除术excitatory tendency兴奋倾向excreta of silkworm蚕的排泄物excusing conditions免责条件excision of abscess脓肿切除术Excision of urethra尿道切除术exchang-rate risk汇率风险