Examples
wǒ我shēng píng生平nán dé难得zuò做le了yí一jiàn件hǎo shì好事...què shì却是méi yòng没用de的。
我生平难得做了一件好事...却是没用的。
For once in my life I'm doing a good deed... And it is useless.
能向别人自顾自地单向倾诉、想说什么就说什么，这比什么都难得。
To have someone you can vent to nonstop, saying absolutely anything on your mind, this is rarer than anything else.