我认为完全正确,如果students前加the就更好了,effort如果和make搭配是不是该用单数,如下面的例句1
effort:努力,尽力
1.I decided to make one more effort.
我决定再作一次努力.
2.His efforts had no smallest chance of success.
他的努力毫无成功的希望.
soil:土,泥土,土壤[U][C]
Some soils are not suitable for farming.
有些土壤不适于耕作.
That farm has a very rich soil.
该农场有一片非常肥沃的土壤.