问题
A welfare unit is a container converted to provide site facilities for workers — typically a toilet, washroom, drying room, and a kitchen or break area. Self-contained welfare units include water tanks, waste tanks, and a generator. They meet workplace health and safety rules on construction and remote sites where mains services are not available.
你知道吗？
Modern welfare units can include kitchens, showers, drying rooms and offices in a single structure. Their popularity comes from combining several site facilities into one transportable unit. 
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