For example, you can imagine that having a sudden and unexpectedfailure in your HVAC can run you several thousand dollars.
比如，你可以想象，你的空调系统突然出现问题，这可能就要花掉你几千块钱。
2
Today, I was showing my Mom how to use the Internet on her phone. As there was bad reception, it said "UnexpectedFailure."
今天我教老妈用手机上网，信号不太好，提示有意外错误。
3
Courage for some sudden act, maybe in the heat of battle, we all respect, but there is that still rarer courage which can sustain repeated disappointment, unexpectedfailure, and shattering defeat.