名词
1. 住房;住宅
You refer to the buildings in which people live as housing when you are talking about their standard, price, or availability.
2. 住房供给;住房建设
Housing is the job of providing houses for people to live in.
3. (机器的)外壳,外罩,护盖
A housing is a case or covering which protects parts of a machine.