B. fasten yourself to a rope and fall from a great height.

B. 把自己绑在绳子上，从高处坠落。

You never know what will happen when you fall from a great height.

你永远不知道当你从高处坠落时会发生什么。

I keep hearing the voice of the paramedic who treated me: You never know what will happen when you fall from a great height.

我一直听到治疗我的护理人员的声音：你永远不知道当你从高处坠落时会发生什么。