但是，大约有一半不吸烟者肺癌病例无法用已知的危险因素进行解释。已知危险因素还包括：石棉、烧薪材的室内火炉和油烟。
But about half of cases of never-smokers with lung cancer cannot be explained by known risk factors, which also include asbestos, indoor wood-burning stoves, and aerosolized oils caused by cooking.
为了让球在门柱下，他们必须学着瞄准得比往常烧低一些，将球的起飞角度降低半度左右。
To get the ball under the bar, they must learn to aim slightly lower than normal, reducing the ball's take-off Angle by around half a degree.
可能还有些烧丙烷的汽车和卡丁车，但一时半会也搞不到。
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