The petroleum is first heated in a boiler to separate the smaller hydrocarbons with lowboiling points from the larger hydrocarbons with high boiling points.
石油先在一蒸发器内加热，从高沸点的大分子碳水化合物中分离出低沸点的小分子碳水化合物。
2
Petrol has a lowboiling point; if a little is poured into the hand, it soon vaporizes.
汽油沸点低，如果倒入少许在手上，它立即就蒸发掉。
3
Since R134a has a relatively lowboiling point, the water is hot enough to convert it into a gas.