这句话的upon什么意思?Firstly,citiesbecomemoreandmorecrowded,puttingmuchpressureupontransportation,housing,sanitation,education,employmentandsoon.

问题：这句话的upon什么意思?Firstly,citiesbecomemoreandmorecrowded,puttingmuchpressureupontransportation,housing,sanitation,education,employmentandsoon.

答案：↓↓↓

李丹风的回答：

网友采纳　　首先,城市变得越来越拥挤,将很大的压力带给了交通、住房、卫生、教育、就业等.　　put...upon,将.加于...之上.