如今，日本的智能马桶也变得更加环保，大部分新马桶每次冲水的用水量不到5升（合1）3加仑），而几年前则为13升。
In recent times , Japanese toilets have also become more environmentally friendly , and most new models now use less than five liters ( 1.3 gallons ) per flush , compared to 13 liters just a few years ago .
升合