Frame #13: Left hand/forearm force application is backward and powered by upper arm adduction.
Frame #13: Left hand/forearm force application is backward and powered by upper arm adduction.
画面13：左手/小臂向后用力，并由上臂内收提供动力。
Frame #13: Left hand/forearm force application is backward and powered by upper arm adduction.
画面13：左手/小臂向后用力，并由上臂内收提供动力。