in half ,at half,by half的区别和用法

in half ,at half,by half的区别和用法
in half ,at half,by half的区别和用法

in half ,at half,by half的区别和用法
in half是分成两半,at half这个at是表示“以”.“以半价”,用at half,by half表示半途的意思,如半途而废说do things by halves.希望我能帮助你解疑释惑.