As it gets colder, it contracts.
当温度降下来时它就收缩。
As it contracts, it pulls on these tissues.
睫状肌一收缩，就拉动这些组织。
When it contracts, the muscle pumps about 2 ounces (59 milliliters) of blood, and is constantly working over a lifetime.
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。
Reduction in contractility, the extent of ventricular contraction and hence the amount of blood pumped from the ventricle when it contracts.
收缩力减弱，心室收缩程度减低，心室收缩时的泵血量减少。
Reduction in contractility, the extent of ventricular contraction and hence the amount of blood pumped from the ventricle when it contracts.
收缩力减弱，心室收缩程度减低，心室收缩时的泵血量减少。
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