Fewer people to pay taxes, not Americans, or Americans, causing rickets spread. 1998-urban, also have a high-rise residential windowsill height of not less than 90 centimeters.

• 人们为了少交税，就不开窗户，或少开窗户，造成软骨病的泛滥。1998年建现代城时，也曾有一个高层住宅窗台的高度不能低于90公分的规定。