What does mutual help mean?

Guangdong Disabled Persons' Federation organized the excavation of anchors for the blind, deaf and physically disabled, and carried out live broadcast activities with goods. In the live broadcast room, anchor Liu Jian took out the goods, put the package close to the camera of the mobile phone, flipped it back and forth twice, and then made a series of gestures. Compared with the ordinary live broadcast room, Liu Jian's live broadcast room is particularly quiet. Except for the _ _ sound when placing the goods, I can only hear the flapping sound when he signs for it. Liu Jian made several sign language gestures to the reporter, and a team member explained that these gestures meant "helping each other".