arm moving up and down造句

• A spring-suspended arm moves up and down with each rotation of the hip.
• The faster one's arms move up and down, parallel with the body, the faster the rate of stride.
• I was standing next to a refrigerator-size device watching through its glass side as a robot-like arm moved up and down, side to side.
• Two independent access arms moved up and down to select a disk, and in and out to select a recording track, all under US $ 3, 200 ( ) per month.
• "Mr . Perryman was seen to be gesturing towards Mr . Yorke, gesturing imitating a monkey using his arms moving up and down in that fashion to his armpits, " Macro said.