2 answers
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There is a foot-pedal opposite the squatting position.
Just step on it with your feet.
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Look at the front or back when squatting on the toilet.
You should be able to see what the switch is.
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At the interface on both sides of the carriage!
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It is generally pedaled, at the back of the urinal; But now the train is still pressed by hand, and if you don't look carefully, you can't really see it, and there is no obvious mark.
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It's usually where you get on the bus, left and right!