例句與造句

1. A combination of crop rotation and fertilizer addition supports the highest maize yield levels . fertilizer addition does not completely offset the effect of crop rotation
   作物輪作與施肥相結(jié)合支持最高玉米產(chǎn)量水平。施肥并不完全抵消作物輪作效果。
2. It's difficult to find combination of crops in a sentence. 用combination of crops造句挺難的