（困难的）要求
the difficult things that you have to do
The demands of nursing are too great for a lot of people. 护理工作的要求之高令很多人都难以承受。
His new job makes a lot of demands on him (= he has to work very hard). 新工作对他要求很高。
The long hours and the physical demands of the work are driving people away from the profession.
Teachers complaint that they simply can't satisfy the enormous demands placed on them.
Many struggle with the conflicting demands of work and family.
See also: demand noun (NEED)