According to the rotor size of Mandal RC5C and Stoks law,a segregation procedure for soil particle size fractionation was designed,and used for the particle separation of Huangmian soil(Calcaric cambisols,FAO),Huihe soil(Haplic greyxems,FAO),and Helu soil(Calcic kastanozems,FAO) in the Loess Plateau of China,and of Orthic Brown Chernozem,and Orthic Black Chernozem in Canadian Prairie.
用新设计出的土壤颗粒分级方法对 3种黄土高原的土壤 (黄绵土、灰褐土、黑垆土 )和 2种加拿大北美大草原的土壤 (典型褐灰钙土、典型黑灰钙土 )进行了分组 ,其结果与吸管法所得的结果相吻合 ,表明这一分级方法的分析误差小、适用的土壤范围广 ,可用于土壤有机质、土壤中N、P、S等元素在不同粒径中分布等研究 。
In South America, a treeless, grassland area.
南美大草原南美洲的一个无树的草原
A large, grassy, almost treeless plain, especially one in Latin America.
大平原尤指南美洲广大、多草、几乎无树的平原
A large grassy plain in South America, with scattered bushes and small trees.
南美草原南美的一个大而多草的平原，零星地长有一些灌木丛和小树
typical vole of the extended prairie region of central United States and southern Canada.
美国中部和加拿大南部广大的草原地区典型的确田鼠。
pasture grass of plains of South America and western North America.
南美和北美西部平原的牧场草。
the most common variety of prairie chicken.
大多数北美草原松鸡。
The prairie is in the central North America.
大草原在北美洲中部。
a cowboy of the South American pampas.
在南美潘帕斯草原的牛仔。
Prairie dogs chiefly live in the Great Plains of North America.
草原袋鼠主要分布在北美的大平原上。
genus of scapose herbs of North and South America having large edible bulbs.
北美和南美的一个具花葶的草本属，鳞茎大，可食。
large gregarious forest-dwelling cranelike bird of South America having glossy black plumage and a loud prolonged cry; easily domesticated.
南美洲象鹤的大型草原栖息的群居鸟，羽毛黑亮，叫声洪亮高远；容易饲养。
perennial poppy mallow of United States southern plains states having rose-red or rose-purple flowers.
分布在美国南部大草原各州的多年生的罂栗锦葵属植物，有玫瑰红或玫瑰紫色的花。
The log houses in the Eastern half of the country, the sod houses of the Great Plains, and the adobe houses of the Southwest all followed this principle.
美国东部地区的木屋、大平原的草屋与西南地区的砖屋都是就地取材。
There and you can see the wide open spaces of the Prairies.
那边能看到北美大草原的开阔空间。
brown mottled North American grouse of western prairies.
北美西部大草原斑驳的褐色松鸡。
Indians hunted the prairie for buffalo.
印第安人在北美大草原上捕猎野牛。
a midwestern state on the Great Plains.
大草原上美国中西部地区的一个州。
common erect hairy perennial of plains and prairies of southern and central United States having sunflowerlike flowers.
美国南部和中部草原产的多毛的多年生草本植物，花类似向日葵。