a serious chronic ailment
It's hard to get up in the cold. Chinese idiom, Pinyin is ch é NK ē n á NQ ǐ, which means that you can't get out of bed because you have been seriously ill for a long time.
A note to the idiom "deep sickness": serious illness or old illness.
a serious chronic ailment
The wolf and the sheep feed together - láng yáng tóng sì
make frequent changes in policies or measures - zhāo gèng mù gǎi
The man who tied the bell must be used to untie the bell - jiě líng xū yòng xì líng rén