1.【解】四头肌
1.the large muscle on the front of your thigh
1.Without lifting your heel up in the air, tighten your quadriceps muscle as hard as you can for ten seconds.
向上举起你的脚后跟，绷紧你的四头肌肌肉坚持10秒。
2.And then he took out a third of my quadriceps muscle.
最后他切除了我三分之一的四头肌。
3.After your knee has stretched out for a while, perform a set of ten quadriceps contractions with your leg in the same position.
在你的膝已经伸展出一阵子之后，在相同的位置做10次股四头肌收缩。
4.The front and back leg quadriceps contract, extending the knees and stretching the lower region of the hamstrings.
股四头肌前侧和后侧收缩，伸直膝盖、伸展腘旁肌下部。
5.The front leg quadriceps contract to support the body weight.
前腿股四头肌收缩，支撑身体重量。
6.The quadriceps muscles along the front of the thigh firmly contract to straighten the knees.
股四头肌处于大腿前侧，有力收缩使膝盖伸直。
7.Quadriceps Stretch: The quadriceps is the muscle in the front of the thigh, important for lifting your knees and increasing your speed.
拉伸股四头肌：股四头肌是大腿前侧的肌肉，对于你提升膝盖和提高速度很重要。
8.The quadriceps muscles down the front of the thighs shorten to straighten the knees.
股四头肌使大腿肌肉向下缩短，膝盖伸直。
9.In Headstand, lift the top of your kneecaps firmly with the quadriceps and keep moving the femurs into the backs of your legs.
保持在头倒立，收紧大腿前的四头肌，绷紧膝盖，仿佛有人在向后推着你的大腿。
10.The quadriceps down the front of the thigh shortens to straighten the knee.
从上到下贯穿大腿前侧的股四头肌收缩，使膝关节伸直。