to no purpose

with no result or effect; pointlessly

無結(jié)果地，無成效地，徒勞地

to the purpose

relevant or useful

與本題有關(guān)的，得要領(lǐng)的，合適的；有用的

you may have heard something from them which is to the purpose.

你或許已從他們那兒聽到了一些有關(guān)的事情。

on purpose

Intentionally; deliberately.

故意地；有意地

to good purpose

With good results.

有益地，有成效地

to little purpose 或 to no purpose

With few or no results.

幾乎徒勞的，少有成效地