stratum use层级使用
stratumn.地层;阶层
stratum pigmenti retinae色素层, 视网膜色素层
stratum griseum centrale(拉)中央灰(质)层
stratum granulosum ovarii泡状卵泡粒层, 卵巢滤泡粒层
stratum bacillare retinae视网膜杆体层
Stratum opticum of retina视网膜视层
stratum of private owners私营业主阶层
stratum griseum profundum(拉)深灰(质)层