The triceps extend the elbows, straightening the arms.
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3. 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.
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4. 股四头肌使后腿膝盖伸直。
The quadriceps straightens the back knee.
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5. 腹直肌使躯干向大腿方向。
The rectus abdominus bends the trunk toward the thigh.
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6. 腹直肌使躯干前弯向直腿。
The rectus abdominus bends the trunk over the straight leg.
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7. 股四头肌使大腿肌肉向下缩短，膝盖伸直。
The quadriceps muscles down the front of the thighs shorten to straighten the knees.
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8. 肱三头肌使手肘伸直。
The triceps straighten the elbows.
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9. 后腿大收肌使股骨延伸，并帮助脚稳定地落于地板上。
The back-leg adductor magnus extends the thigh bone and helps stabilize the foot on the floor.
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10. 处于胫骨外侧的腓长肌和腓骨短肌使脚掌内侧向下压地。
The peroneus longus and brevis muscles along the outside of the shin press the inside of the sole of the foot into the floor.
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11. 大臂上的二头肌使手肘弯曲，拉向躯干的方向，辅助伸展动作。
The biceps of the both upper arms bend the elbows, drawing the torso into the stretch.
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12. 咽缩上肌辅助颚咽的闭锁，而咽上缩肌和咽缩中肌使食物蠕动较容易。
The superior pharyngeal constrictor assists in gaining velopharyngeal closure, while peristaltic movement of food is facilitated by the middle and inferior pharyngeal constrictors.
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13. 颚帆提肌使软颚上升，悬雍垂肌使软颚成串，颚帆张肌拉紧也使软颚缩短。
The levetor veli palatini muscle elevates the soft palate, the muscle uvulae bunches the soft palate, and the tensor veli palatini tenses and shortens the palate.
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14. 骨盆保持着平衡，因为腰肌使大腿前侧屈曲，臀肌使大腿前侧伸长或者伸展。
The pelvis is kept balanced because the psoas flexes the thigh, and the glutei make the thigh lengthen, or extend.
First, he has introduced a gene that turns out a stunted version of the myostatin receptor, the molecule that sits in the surface membrane of muscle cells and receives the message to stop growing.
When our ancestors were covered in fur, muscles in their skin called "arrector pili" contracted when they were upset or cold, making their fur stand on end.
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17. 平滑肌不同于我们熟悉的那种包覆骨骼并使身体运动的肌肉。
Smooth muscle is different from the familiar sort that cloaks bones and enables bodily movement.
This, says Dr Kerr, points to a biological basis for the illness and holds out hope that a blood test could be developed to identify its different forms.
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19. 我的孩子不应该，把书本尽可能放远，以便使睫状肌松弛？
Shouldn't my child hold the book as far away as possible to relax the focusing muscles?
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20. 颧骨的主肌肉使嘴角上扬，眼轮匝肌挤压眼睛使其弯成非常令人满意的、像鸟足一样的扇形。
The zygomatic major muscle that turns the corners of the lips up, and the orbicularis oculi muscle that squeezes the eyes into the famous fanned wrinkles also known as crows feet.
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21. 只有由睫状肌收缩，短暂的近调焦使远距离得到松弛。
It wants to be relaxed for distance, with the ciliary muscle contracting only for brief periods of close focusing.
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22. 使嘴角上翘的颧主肌和能把眼睛挤入扇形皱纹也就是鱼尾纹的眼轮匝肌。
The zygomatic major muscle that turns the corners of the lips up, and the orbicularis oculi muscle that squeezes the eyes into the famous fanned wrinkles otherwise known as crows feet.
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23. 这种体态使上胸和肩稳定，从而更容易使用副呼吸肌。
This posture stabilizes the upper chest and shoulders, making it easier to use the accessory breathing muscles
The muscle-computer interface enables hand and finger input by means of gestures learned from an electromyographic recognizer collecting muscle signals from a band of sensors on the upper forearm.
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25. 这个问题可能是纤维肌痛，这种病中的疼痛信号的故障使关节、肌肉和组织过敏。
The issue could be fibromyalgia, in which a breakdown of pain signals leaves joints, muscles and tissues hypersensitive.
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26. 在山式中强有力地外展肱二头肌，但要保持前臂和手掌向内转，使手掌对头大腿。
Turn your biceps strongly outward in Tadasana, but keep your forearms and palms turning inward so that your palms face your thighs.
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27. 三角肌中部使肩膀外展，将肩膀向远离躯干的方向拉。
The middle portions of the deltoids abduct the shoulders, drawing them away from the trunk.
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28. 中斜方肌和菱形肌将肩胛骨向脊柱的方向拉，使胸廓前侧打开。
The middle trapezius and rhomboids draw the shoulder blades toward the spine, opening the front of the chest.
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29. 股四头肌伸展直腿，使膝盖保持在伸直状态。
The quadriceps of the extended leg holds the knee straight.
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30. 股四头肌伸展直腿，使膝盖保持在伸直状态。
The quadriceps of the extended leg holds the knee straight.
