"这个表达不符合英语的习惯"这个句子英语要怎么翻译?

This is not an idiomatic English expression.

idiomatic:符合语言习惯用法的containing expressions that are natural to a native speaker of a language:

例句：
She speaks fluent and idiomatic English.

This is not an idiomatic English expression.

this expression doesn't accord with english grammar or slang.

this expression is not typical english