Blackland element with fertility taller and celebrated, but come for years its fertility drops apparently.黑土素以肥力较高而著称, 但多年来其地力明显下降....

blackland的音标：blackland的英式发音音标为：[b'læklænd]blackland的美式发音音标为：[b'læklænd]...

n.黑土，黑土地带...