n.四頭肌
The quadriceps muscle brings your knee into full extension. 四頭肌肌肉讓你的膝進入完全的延長。
To strengthen weak knees, the quadriceps group of muscles need to be strengthened. 只有股四頭肌被加強的時候虛弱的膝關節(jié)才能得到加強。
