此项训练包括伸展和收缩腿部肌肉。
The exercise consists of stretching and contracting the leg muscles.
心脏收缩时，血液才从心脏射出。
子宫开始每隔五分钟收缩一次。
心脏肌肉收缩以挤压出血液。
所有的木头都会收缩。
在这项运动中，肌肉是在延伸而不是在收缩。
In this exercise, the muscles are elongating rather than contracting.
股票市场骤然收缩，让他们剩下了许多无人要的股票。
The sudden contraction of the markets left them with a lot of unwanted stock.
你应该看到你的腹部扩张和收缩。
睫状肌一收缩，就拉动这些组织。
最常见的头痛类型是紧张或肌肉收缩。
The most common type of headache is a tension or muscle contraction.
当温度降下来时它就收缩。
低温使金属收缩。
如果肌肉收缩，色袋就会膨胀，你就会看到不同的颜色。
If the muscle's contract, then the sack expands, and you can see the colors.
无可否认，农村的商业活动有所收缩，但其活力仍然惊人。
Admittedly there has been a contraction of village commerce, but its vigour is still remarkable.
它可以收缩成一个小圆石的形状，并完全静止地坐在海底。
It can contract into the shape of a little round stone, and sit perfectly still on the seafloor.
面部肌肉的收缩既能影响人的内心情绪，又能将它反映出来。
The contraction of facial muscles both influences the internal emotional state and reflects it.
他认为，在任何时候，蝴蝶都可能展开翅膀，收缩自己的身体。
He thought that at any time, the butterfly might spread its wings, shrink the body.
人造肌肉能在收缩过程中产生电力。这种电力未来甚至能为手机充电。
Artificial muscles can generate electricity during constriction. The electricity may even charge up your mobile phone.
物理学家费边推断，当星系间的气体冷却时，较冷的气体向星系中心收缩。
The physicist Fabian reasoned that as intergalactic gas cools, the cooler gas shrinks inward toward the center of the galaxy.
几个世纪过去了，岩石冷却、硬化，随后收缩、开裂，变成了长长的石柱。
As the centuries passed, the rock cooled and hardened, shrinking and cracking into long columns.
睡觉期间，胸腔所做的呼吸活动会减少，这使得横膈膜的收缩变得更加重要。
Movements of the rib cage for breathing are reduced during sleep, making the contractions of the diaphragm more important.
他们可以追踪大陆冰川的生长和收缩，即使是在温度变化不大的海洋区域——比如，赤道附近。
They could trace the growth and shrinkage of continental glaciers, even in parts of the ocean where there may have been no great change in temperature—around the equator, for example.
与橡木相比，其他木材的膨胀和收缩速度不同，所以用这些木材做的橡木船的修理会出现裂缝或漏水。
Other woods expand and contract at different rates than oak, so repairs to oak ships done with those woods split or leak.
随着细胞的死亡，有些人大脑前部和侧部的收缩，在三十多岁时就能观察到，但是也有些人直到六七十岁依然不明显。
Contraction of front and side parts as cells die off was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds.
天文学家的理论是，当一个巨大的物体在其自身的引力作用下灾难性地收缩，只留下一个强大的引力场，且没有任何东西能逃脱时，黑洞就形成了。
Astronomers theorize that a black hole forms when a massive object shrinks catastrophically under its own gravity, leaving only a gravitational field so strong that nothing escapes it.
严重偏头痛可以用一种收缩血管的药物来治疗。
Severe migraines can be treated with a drug that constricts the blood vessels.
玻璃遇冷收缩。
收缩血管的药
为了达到最好的效果，把注意力都集中在收缩的盆底肌上。
For best results, focus on tightening only your pelvic floor muscles.
太空地质学家猜测这些陡坡是在几十亿年前当行星表面冷却收缩时开始形成的。
Astrogeologists suspect that these scarps having formed billions of years ago as the planet's surface cooled and shrank.
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