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.几乎徒劳的，少有成效地

例句：

“And ever those, who would enjoyment gain/Must find it in the purpose they pursue”(Sarah Josepha Hale) “于是那些想要得到快乐的人/一定会在他们的追求的目标中寻求到它”(撒拉·约瑟法·黑尔)