基本解释[生物学]营养层英汉例句双语例句The anther is made up of an outer epidermis, a middle fibrous layer, and an inner nutritive layer, the tapetum.花药壁由外表皮层，中间纤维层，内部营养层和绒毡层构成。nutritive layer更多例句专业释义生物学营养层