快门线 meaning in Chinese

cable release
shutter release

Shutter cable release tips and sockets for cameras
照相机用快门线释放端子和插座
Screw threads of shutter cable release ; tip and socket , connecting dimensions
快门线点动开关螺纹.接头和插口.连接尺寸
We bipods become tripods when we lean against a wall and using the automatic shutter release makes it even steadier
当我们或靠在墙上，或用一条自动快门线使其固定，即使是用手端相机也跟使用了三脚架一样。