How to wring water with a traditional mop?

Go to Taobao to have a look Some hands can be wrung dry without water, without electricity. Pull your hand back and forth on the mop to make a clip or something, hold a mop head to squeeze out the water, and some of them are wrung out by mechanical devices.

You can also step on the mop with your feet and then turn the mop rod. But it's easy to break the mop. .....