extraoral口外的extraadj.额外的n.额外之物；临时演员adv.特别地extra-long tunnel under construction在建特长隧道extravehicular self-maneuvering unit舱外用自动稳定和移动装置Extradural transection of spinal nerve脊神经硬膜外横切术extraceUular signal-regulated kinase细胞外信号调节激酶Extracorporeal bench surgery of kidney体外离体肾手术extracorporeal magnetic filed coupling外磁场耦合Extracellu ar matrix degrading enzymes细胞外基质降解酶extra-gastrointestinal stromal tumor胃肠道外间质瘤extracellular signal-regulatedkinase细胞外信号调节激酶extracellular signal-regulate kinase细胞外信号调节激酶