【计】 黑箱模型, 未知框模型\n【化】 黑箱模型

The black ox has trod on sb.'s foot

in the case of black ice, compacted snow, icing

black soybean seed-coat

black-and-white lattice【晶体】

black brick

black top pavement (bituminous pavement)

black measles;nigral rubeola

Ribes americanum Mill.;American black currant;wild black currant