Laughter produces short-term changes in the function of the heart and blood circulation, increasing heart rate and oxygen consumption.
笑会造成心脏和血液循环功能的短期变化，增加心率和耗氧量。
One of the chief advantages of this technique was that large quantities could be injected within short periods without risk of overloading the circulation.
这项技术的一个主要优势是短时间内可以注入大量的红细胞而不会出现循环过载的危险。
Silver, because the circulation time is short, there is very little, the modern mechanism of the famous silver treasures, this gold casting precision.
银币，因流通时间短暂，存世甚少，是近代机制银币之著名珍品，此枚铸造精。
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