demands是什么意思？

It demands physical endurance and patience.

Professional fashion models are particularly vulnerable to eating disorders resulting from occupational demands to maintain extreme thinness.

So you feel he's been making unrealistic demands on you?

This level of wastage is a tragedy that cannot continue if we are to succeed in the challenge of sustainably meeting our future food demands.

The challenge is that an increase in animal-based production will require more land and resources, as livestock (牲畜)farming demands extensive land use

Our society depends on them being able to make critical decisions about their own medical treatment say, or what we must do about global energy needs and demands.

Perlow calls this vicious cycle the "cycle of responsiveness": Once bosses and colleagues experience an employee's increased responsiveness, they increase their demands on the employee's time.

Smart basketball players or skilled musicians need to pay close attention to the demands of high performance, to the challenges to be overcome.