n.胚芽鞘...

Coleoptile A sheath like structure that protects the developing plumule in grasses.用来保护发育的胚芽的鞘状的结构....

coleoptile的音标：coleoptile的英式发音音标为：[ˌkəʊlɪ'ɒptɪl]coleoptile的美式发音音标为：[ˌkoʊlɪ'ɒptɪl]...