If the temperature falls below a particular threshold, a warning light comes on.如果温度降到某个底线，警示灯就会亮起来。The price of houses is not likely to fall below the present level for some time to come.房价一时不见得会跌到目前的价格以下。It's supposed to fall below zero tonight.今晚气温可能降到零度以下。The thermometer falls below cipher twice every year.每年两次温度计降至零度以下。