It crashed because a computer was outputting data in pound-force seconds rather than newton-seconds.

它崩溃是因为计算机以磅力秒而不是牛顿秒为单位输出数据。

We've talked a lot about inputs and outputs in this series, but they've mostly been between different parts of a computer – like outputting data from RAM or inputting instructions to a CPU.

我们在本系列中讨论了很多关于输入和输出的内容，但它们主要是在计算机的不同部分之间进行的——例如从 RAM 输出数据或向 CPU 输入指令。

We won't get into too much detail as to how it works, but by emitting green light, the watch's optical PPG sensor tracks blood circulation of your wrist, which outputs data to measure a little thing called your heart rate.

我们不会详细介绍它是如何工作的，但是通过发出绿光，手表的光学 PPG 传感器跟踪你手腕的血液循环，输出数据来测量一个叫做心率的数据。