白白

wǒ bái bái làng fèi le jīng lì

我白白浪费了精力。

I made my effort in vain.

bù yào bái bái cuò guò dà hǎo shí jī

不要白白错过大好时机。

Don't let a golden opportunity slip through your fingers.

xǔ duō zhàn shì bái bái xī shēng le

许多战士白白牺牲了。

Many soldiers died needlessly.

tā bái bái máng le yī zhèn zi

她白白忙了一阵子。

She busied herself for quite some time for nothing.

bái bái làng fèi yī gè jī huì

白白浪费一个机会

let an opportunity slip through one's fingers

ràng yī qiè bái bái làng fèi diào zhēn shi kě xī le

让一切白白浪费掉，真是可惜了。

It seemed a pity to let it all go to waste.

bái bái sòng sǐ

白白送死

die in vain

bù yào ràng shí guāng bái bái liú shì

不要让时光白白流逝。

Don't let time slip by.

zhè jiǎn zhí bái bái làng fèi jīng lì

这简直白白浪费精力。

This simply means a waste of energy.

wǒ men bái bái zǒu nà me yuǎn de lù

我们白白走那么远的路。

We went all that way for nothing.