A formula for a particular situation, usually a good one, is a course of action or a combination of actions that is certain or likely to result in that situation.
In science, the formula for a substance is a list of the amounts of various substances which make up that substance, or an indication of the atoms that it is composed of.
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(赛车的)级,方程式
Formula is used followed by a number to indicate a particular type of racing car or something relating to that type of car.