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.

    e.g. ...a shortage of affordable housing...
           保障房的短缺
    e.g. Poor housing and family stress can affect both physical and mental health.
           住房条件差、家庭压力大会影响身心两方面的健康。

2. 住房供给;住房建设
    Housing is the job of providing houses for people to live in.

    e.g. ...graduate courses in housing and public administration...
           住房建设和公共管理的研究生课程
    e.g. If you are a council tenant call the housing department about it.
           市建住房租户请就该问题致电住房部。

3. （机器的）外壳，外罩，护盖
    A housing is a case or covering which protects parts of a machine.

housing的意思

    e.g. Both housings are waterproof to a depth of two metres.
           两个机罩的防水深度均为两米。