Consumption of domestic fuel oil varies between150 gallons a month at the height of winter and practically nothing in July-August.
家用燃料的消耗量变动很大，严冬每月耗油１５０加仑，而七八月份几乎等于零。
He varies the treatment according to circumstances.
他根据情况，变换治疗方法。
Our routine never varies.
我们的常规从无变化.
