Many things have different functions when used in different places. From ancient times to the present, people used to use people to carry heavy things, such as stones. However, with the development of society, this rule has changed. I don't know if you have heard of micro electric hoists, and there are other unexpected uses that can also be used as "nannies". The thing is, Mr. Li is a university teacher, and his father has a poor waist. As long as he lies down, he cannot get up himself.

His father was very stubborn and determined not to invite anyone, unwilling to drag others down. The micro electric hoist happened to be able to help him, as long as he could stand up, activity would not be a problem. I am particularly happy to have solved the problem, so the existence of nothing plays a different role in different situations.