Employ your own weight: Grasp the tripod collar or centerpost firmly in your left fist and press downward while operating the camera with your right hand.

• 用左手紧紧抓住三角架的领子（三脚架的领子？它穿衣服么？我猜应该是云台下三条腿结合的地方吧。）或者是中柱，往下使劲儿，右手*控相机。