The heart muscles contract to expel the blood.
心脏肌肉收缩以挤压出血液。
All right, your muscles contract.
好的，你的肌肉收缩。
Muscles contract by a sliding-filament mechanism.
肌肉以滑动丝的机制产生收缩。
You're so cute you make my zygomaticus muscles contract.
你是如此可爱，让我的颧肌相遇。
These muscles contract when we breathe in, expanding the lungs and drawing in air.
当我们吸气的时候，这些肌肉就收缩，扩大肺部并吸入空气。
Slow lifting. Many people contract their muscles slowly and then release more quickly.
很多人收缩他们的肌肉很慢，但是放松很快。
When you bend your elbow, the muscles of the arm contract.
当你弯曲肘部时，手臂上的肌肉就收缩。
Contract your front thigh muscles to lift your kneecaps.
收紧大腿前侧肌肉，锁住双膝。
When you bend your elbow , you contract the muscles of the arm.
你屈肘时，手臂的肌肉就会收缩。
When you bend your elbow, you contract the muscles of the arm.
要从肘部弯曲手臂，就要收缩上臂正面的肌肉。
When you bend your elbow, you contract the muscles of the arm.
你屈肘时，手臂的肌肉就会收缩。
This causes the horse to contract his muscles, then relax.
这样可以使马先收缩肌肉然后放松。
When you bend your elbow, you contract the muscles of the arm.
同时肘部轻轻弯曲，胳膊向后伸，这样你的肱二头肌就压在耳边了。
When you bend your elbow, you contract the muscles of the arm.
同时肘部轻轻弯曲，胳膊向后伸，这样你的肱二头肌就压在耳边了。
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