Carbon monoxide and oxygen compete to bite hemoglobin in your blood, which stresses the circulatory system.

一氧化碳和氧气争先恐后地与血液中的血红蛋白结合，这给血液循环系统带来了压力。

But as growing populations and densely packed cities stress these systems, innovators around the world are imaginating faster more sustainable ways to get from A to B.

但不断增长的人口和密集的城市对这些交通系统造成了压力，世界各地的革新者都在设想从A地到B地的更快更可持续的方式。

Now she's responding emotionally to me as well, so we've gone all the way down to virtual neurotransmitters, hormones, and so forth, so Baby X has a stress system.

现在她也对我做出情感上的反应，所以我们一直到虚拟神经递质、激素等等，所以婴儿 X 有一个压力系统。