quantity
某物的数量(可测量的多少)
amount
数量(更通用,尤其用于不可数名词)
The survey measured the quantity of food wasted per household each week.
调查测量了每个家庭每周浪费的食物数量。
A significant amount of effort has gone into redesigning the city's public transport system.
为重新设计该市公共交通系统投入了大量努力。