任重道远rèn zhòng dào yuǎntake a heavy burden and embark on a long road; ability to carry heavy responsibilities through thick and thin; It is a long-term; arduous task; It is an arduous task and the road is long

HSK Level 6

Learning Chinese is a long and arduous journey, I need to practice every day.

Protecting the environment is a long and challenging task that requires everyone's joint efforts.