氣溫大大低于冰點時最好是呆在室內,除非你迫于生計而不得不外出。
It's best to keep in while the temperature is so for below freezing point, unless you have to go out to earn your living.
他怕警察會認出他來,因此白天他從不外出。
As he feared that the police would recognize him he never went out in daylight.