枉自

wǎng zì kāi le nà me duō cì huì dàn què shì háo wú jié guǒ

枉自开了那么多次会，但却是毫无结果。

We have had quite a few meetings, but to no purpose.

tā xiǎng ràng tā men rèn zhēn de tīng dí què shì wǎng zì fèi lì

他想让他们认真地听的确是枉自费力。

It was a vain attempt for him to make them listen attentively.

tā men wǎng zì fèi le bàn tiān jìn què shén me yě méi bàn chéng

他们枉自费了半天劲，却什么也没办成。

They toiled for a long time to no avail.

wǎng zì tǎo lùn le nà me duō cì wèn tí hái shi méi yǒu jiě jué

枉自讨论了那么多次，问题还是没有解决。

We have discussed the problem several times but to no purpose.

bù yào shàng le nǐ men lǎo bǎn nà xiē yǒu yán wú shí de xǔ nuò de dàng wǎng zì kōng xī wàng yī chǎng

不要上了你们老板那些有言无实的许诺的当，枉自空希望一场。

Don't be deluded into false hopes by your boss' meaningless promises.