Instead of windows, the new systems used tunnel fans to circulate air.

VOA: special.2009.09.08

Hemoglobin, as you know, is an oxygen carrier and so red blood cells concentrate in bags of hemoglobin which circulate in your blood and they carry oxygen.

众所周知,血红蛋白可以携带氧气,含有大量血红蛋白的红细胞,在全身循环,以携带氧气

耶鲁公开课 - 生物医学工程探索课程节选

When they do that, this insulin then starts to circulate throughout the blood.

当胰岛素开始分泌后,胰岛素就开始通过血液来循环

耶鲁公开课 - 生物医学工程探索课程节选

Then that insulin would accumulate in the muscle, enter the blood, and circulate all over the body and so you'd turn the muscle into an insulin making tissue.

胰岛素会在肌肉组织中累积,并进入血液,使其在全身循环,如此就使肌肉成了能产生胰岛素的组织

耶鲁公开课 - 生物医学工程探索课程节选