食品和汽油是大家频繁购买的物品，所以他们的价格比起那些耐久品来说相对不稳定。
Food and petrol are frequent purchases and their prices tend to be less "sticky" than those for more durable goods.
结果表明：汽油机冷起动后，缸内处于不稳定的燃烧状态，出现不完全燃烧或失火，并且各缸间的燃烧稳定性相差很大。
The result shows that after cold start combustion in the cylinder is unstable and incomplete combustion or misfire exits. There is much difference between cylinders in combustion stability.
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