缓慢地将腿部拉直，并使腿部保持伸直状态，同时将大腿向头部方向牵引。
Gently straighten the leg and, keeping it straight, draw it in towards your head.
股四头肌和大腿前侧使膝盖伸直。
The quadriceps along the front of the thigh straightens the knee.
大腿前侧的股四头肌使膝关节伸直。
The quadriceps at the front of the thigh straightens the knee.
按钮使你的座位伸直。
昨天上课之前的热身运动使我今天的腿都不能伸直。
Yesterday, as a warm-up exercise before class so I can stretch out the legs.
昨天上课之前的热身运动使我今天的腿都不能伸直。
Yesterday, as a warm-up exercise before class so I can stretch out the legs.
应用推荐