The idea is good but is not workable.

　　這個(gè)點(diǎn)子倒是不錯，只是行不通。

　　Your idea is good but is not workable.

　　你的心勁倒不孬，但就是行不通。

　　Establish a workable budget.

　　做一個(gè)可行的衣服購置預算。