例句與造句

1. Because small watersheds are the source of runoff and sediment into big rivers and also the joint of river to overall basin , the established various comprehensive prevention and harness systems in small watersheds are the basic treatments and effective way for controlling soil and water loss
   小流域是大江大河產(chǎn)水、產(chǎn)沙的源頭，是江河與面上聯(lián)結(jié)的紐帶，在小流域中修建的各種綜合防治體系，是治本清源的做法，是有效防治水土流失的形式。
2. It's difficult to find source of runoff in a sentence. 用source of runoff造句挺難的