当这些肌肉收缩的时候，对于脊骨、盆骨以及肩部起到固定、支持的作用。
When these muscles contract, we stabilize the spine, pelvis and shoulders and create a solid base of support.
每当你感觉到冷，这些肌肉收缩，毛发在你的膀子上站了起来，你的皮肤就看上去很有趣，疙疙瘩瘩的。
When you're cold and these muscles tighten, the hair on your arm stands up. This gives your skin a funny, bumpy look.
当它收缩的时候，这些肌肉向外泵出大约2盎司(59毫升)的血液，而且在人的一生中它不断地工作。
When it contracts, the muscle pumps about 2 ounces (59 milliliters) of blood, and is constantly working over a lifetime.
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