Most petroleum products, including kerosenes, fuel oils, lubricating oils, and waxes, are fractions of petroleum that have been treated to remove undesirablecomponents.
其他石油产品，如汽油、芳烃溶剂、甚至包括有些沥青，则是通过完全或者部分合成而制造的。
2
The farther the air is from the fuselage, the faster it moves. That can produce undesirable stress on an engine’s components.
气流通过机身的距离越长，它的速度就越快，会对发动机部件产生不必要的压力。
3
In all cases, you should take precautions against importing malicious code or code that has unintentional but undesirable impact on your IDE and the server hosting the components.