excretive造句

Retiary fibers, excretive articles and host cell with the ball cyst.
囊内面有分泌颗粒、网状纤维及绒球状宿主细胞.

Is drivel how of excretive and generation? Can be you synthesized artificially?
鼻涕是如何分泌的和产生的? 可以人工合成 吗 ?

• #excretive