[heavy burden]
Now it is often used to describe important work and tasks, and the burden only falls on one's shoulders.
Word decomposition
Release a thousand catties; Thousands of pounds; Very heavy; Important; Of great significance; ; Blame or bear a heavy burden: jack explains. Short for Jack. See "Jack". The device for preventing the reverse rotation of gears in the machine consists of toothed parts and springs mounted on the shaft. Interpretation of heavy burden: heavy tax burden: metaphor of heavy responsibility. Metaphor is heavy work. Li Hui: "People who bear the burden of salt and salary share the burden and rest in the shade." People's Literature,No. 1 in 2000: "The Prime Minister took the heavy burden with all his heart and took pains to carry the basket.