For example, rockysoil may prevent the digging of pit-type systems.
例如，岩质土，不能挖掘坑洞式厕所；
2
Because of the rugged terrain and dry, rockysoil, agriculture is restricted to one third of the land. Transportation is difficult.
由于地势起伏、干燥缺水和土壤少，希腊只有三分之一的土地可用于农业耕作，交通运输也很困难。
3
They were luckier than their fellow Puritans atPlymouth Bay, who subsisted as independent farmers, wresting meagre harvests ofmaize from the rockysoil of New England.