blood简单

Schwitzgebel predicted the intervention would have no effect; he had previously found that ethics professors do not differ from other professors on a range of behaviors, including voting rates, blood donation and returning library books.

施维茨格贝尔曾预测这一干预不会产生任何效果；他此前发现，伦理学教授在一系列行为上与其他教授并无不同，包括投票率、献血和归还图书馆书籍。

If we adults could indulge in a bit of silliness and giggling, we would reduce the stress hormones in our bodies, increase good hormones like endorphins, improve blood flow to our hearts and even have a greater chance of fighting off infection.

如果我们成年人能放纵自己犯点傻、咯咯笑一笑，就能减少体内的压力激素，增加内啡肽等有益激素，改善心脏的血液流动，甚至更有可能抵御感染。

Laughter does [produce] short-term changes in the function of the heart and its blood vessels, [boosting] heart rate and oxygen consumption.

笑确实会使心脏及血管的功能产生短期变化，使心率加快、耗氧量增加。