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This can't be defined in terms of a few, but it can't be calculated. But according to the classification, there are three types, one for men and one for each woman, and one for men and women.
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Three, male, female, transgender.
Finally, let's talk about why the mainland does not use seawater to flush toilets, first of all, many places in the mainland do not have sea, and some coastal areas are basically not short of fresh water resources. If we want to learn how to use seawater in Hong Kong, we will have to lay new pipelines, and such a cost investment is obviously unnecessary. So I think the reason why the coastal areas of the mainland do not use seawater to flush toilets is not only the increase in costs, but more importantly, there is no need for this, and the mainland has not reached such a lack of fresh water resources. >>>More
Water Conservancy Bureau, Environmental Protection Bureau, Urban Management Office, Guardian Bureau.
Two toilets, one men's restroom, one women's restroom!