cost-efficient

grammar · medium

易错句子This new software is cost-efficient than the old version.

正确表达This new software is more cost-efficient than the old version.

than 引导比较时，形容词必须用比较级；cost-efficient 是多音节复合形容词，比较级要用 more cost-efficient，不能直接用原级。

grammar · medium

易错句子This method is enough cost-efficient.

正确表达This method is cost-efficient enough.

enough 修饰形容词时必须后置，放在形容词之后；enough cost-efficient 是受汉语‘足够划算’语序影响的中式表达。

grammar · medium

易错句子We need a cost efficient solution.

正确表达We need a cost-efficient solution.

cost-efficient 是复合形容词，放在名词前作定语时通常要用连字符连接，写成 cost-efficient；汉语没有连字符，学习者容易漏写。