Suddenly, a digital screen reads out the oxygen level in our bloodstream.

突然， 一个数字屏幕显示出我们血液中的氧气含量。

The ones that you'll hear native English speakers using every day, so I'm going to start and when you see that sentence pop up on screen, read it back to me as if we were having this conversation together.

你会听到以英语为母语的人每天都在使用这些表达，所以我要开始了哦，当你看到屏幕上弹出句子时，请把它读给我听，就像我们在进行对话一样。