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.
特殊设计的侧头限制保护头部和颈部。
Specially designed side head restraints protect the head and neck.
稍微把他的头拉向你，然后在他的一侧使用一些压力。
Slightly tip his head toward you and apply light pressure to his side.
稍微把他的头拉向你，然后在他的一侧使用一些压力。
Slightly tip his head toward you and apply light pressure to his side.
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