stratum use层级使用
stratumn.地层;阶层
stratum consistency地层分层一致性
Stratum ventilation层式通风
stratum gelatinosum胶质层(嗅叶)
stratum of a society社会阶层
stratum subvasculare血管下层, 粘膜下层
stratum functionalis[子宫内膜]功能层
stratum distributing地层分布
stratum distribution地层分布
Stratum relationship阶层关系
stratum germinativum马尔皮基氏层,生发层