pivot, 回動

US20130045074 (Loading Devices and Methods Of Loading Pipe Fusion Machines)
"A loading device for lifting an elongated object having an elongate axis includes a frame having a first fulcrum surface and a second fulcrum surface, a first effector arm that pivots about（回動、枢動）the first fulcrum surface, a second effector arm that pivots about the second fulcrum surface, and an actuator moving the first effector arm and the second effector arm between a retracted position and a deployed position." (Abstract)

US8562496 (Thigh exercise machine with rocking user support)
"The user support pivot mount may have a single pivot or multiple pivots, and in the latter case the user support pivots about（回動、枢動）a theoretical pivot mount of the combined pivotal motion."

US7731636 (Resistance system for an exercise device)
"4. The exercise device of claim 1, further comprising: a chain connected with the frame; a first sprocket connected with drive shaft and engaged with the chain; a second sprocket connected with the treadle member of the first treadle and configured to engage the chain to rotate the first sprocket as the first treadle pivots about（回動、枢動）the lateral pivot axis."