今天的温度是零下五度。
jīntiān de wēndù shì língxià wǔdù 。
Today's temperature is minus five degrees.
外面零下，我要穿暖和的衣服。
wàimiàn língxià ， wǒyào chuān nuǎnhuo de yīfú 。
It's below zero outside, I need to wear warm clothes.
这个冬天非常冷，常常零下。
zhègè dōngtiān fēicháng lěng ， chángcháng língxià 。
This winter is very cold and often below zero.