Nowadays the idea which used to solve many emergent cases______(已被证明是不切实际的)的翻译：Nowadays the idea which used to solve many emergent cases______ (has been proved to be impractical) 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

nowadays the idea which used to solve many emergent cases______ (has been proven to be unrealistic)

Nowadays the idea which used to solve many emergent cases______ (has been proved to be impractical)

Nowadays the idea which used to solve many emergent cases______ (already by proof was impractical)

The idea which Nowadays used to solve many emergent cases _ _ _ _ _ _ (which has proved to be impractical)

Nowadays the idea which used to solve many emergent cases______ (has been proved to be impractical)