wànɡ
喝水不忘掘井人
hē shuǐ bù wàng jué jǐng rén
When drinking water, don't forget those who dug the well
这件事我一辈子也忘不了。
zhè jiàn shì wǒ yí bèi zi yě wàng bù liǎo
I will never forget this matter for the rest of my life