例句與造句

1. Data from two experimental sites demonstrate that the big difference in yields can be obtained by using different combinations of variety , fertilizer and plant population
   兩個(gè)試驗(yàn)點(diǎn)的數(shù)據(jù)顯示，采用不同的品種、肥料和密度組合能得到巨大產(chǎn)量差異。
2. It's difficult to find combination of varieties in a sentence. 用combination of varieties造句挺難的