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2002年,国际摩联在考虑到两冲程发动机尾气排放污染较大等一系列因素后,实行了新规则,将摩托车最高级别的比赛
In 2002, after taking into account a series of factors such as greater pollution of two-stroke engine exhaust emissions, the International Federation of Motorcycles introduced a new rule that will be the highest level motorcycle competition