家用燃料的消耗量變動(dòng)很大，嚴冬每月耗油１５０加侖，而七八月份幾乎等于零。
Consumption of domestic fuel oil varies between150 gallons a month at the height of winter and practically nothing in July-August.
（坐標的）起點(diǎn)函數自變量的值等于零
An argument at which the value of a function vanishes.
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