栽培变种

紫斑牡丹栽培品种小孢子发育过程的细胞遗传学研究

arable land【农】;cropland【农】;cultivated land【农】

total cultivated area

cultivated land

cultivated plant

cultivated silk

cultivated variety【农】

cultivated horizon

arable area【农】经;cultivated area【农】经;