这两个都有速度快的意思，但是用法不同。发展快速更侧重于一个深远杜所以应该是用第一个。
The rapid increasing population will bring many severe problems，such as the faster illness spreading，lack resource and so forth.
The rapid growth of population may cause a lot of problems, such as disease proliferation, lack of resource, etc.
The population of China has increased too fast.
Rapid population growth will bring many serious problems. For example, disease transmission speed, resource shortage
quick通常用于修饰动作快，而fast通常用于修饰速度快，所以发展速度快应该用fast.
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芥末花vera
