伸直伸直或伸展肢体的行为 The act of straightening or extending a limb.
屈体跳水，镰刀式跳水头向下的一种跳水动作，把身体弯到腰部、腿伸直，在打开身体且以手先触水的姿势跳入水中以前，要先用手触脚 A dive executed by jumping headfirst, bending the body at the waist, and, with the legs straight, touching the feet with the hands before straightening out to enter the water hands first.
他伸直身体躺在草地上睡着了。 He stretched himself out on the grass and fell asleep.
