例句與造句

1. Of these two primary grades all other grades were varieties .
   其它種種級(jí)別都是這兩種主要級(jí)別的異稱(chēng)。
2. Since research shows that children in the primary grades and minority and low - income children benefit most from smaller classes , it makes sense to direct resources particularly toward these children
   由于有研究表明，低年級(jí)學(xué)生、少數(shù)民族學(xué)生、來(lái)自低收入的家庭的學(xué)生從小班中受益最大，因此應(yīng)優(yōu)先選擇這些學(xué)生。
3. It's difficult to find primary grade in a sentence. 用primary grade造句挺難的