extra ply附加层
extraadj.额外的n.额外之物;临时演员adv.特别地
Extracurricular-sports课外体育活动
Extracurricular research课外科研
extracellular tachyzoite细胞外速殖子
extra-curriculum books课外书
Extracellular expression胞外表达
extranuclear inheritance核外遗传
extra large size bearing特大型轴承
extratropical jet stream温带急流
extra-deep water level超深水位
Extracellu- lar matrix细胞外基质