Mar.

1.The expressway mars the beauty of the countryside.

速路破坏了农村的田园美景。

2.Bad diction marred the effectiveness of his speech.

措词不当影了他演说的效果。

3.A tragedy marred the 1960 cycling competition when Danish cyclist Knur Jensen collapsed and died during the road race.

丹麦自行车选手克那德·金路赛途中倒了下来，当即死亡，给1960年的自行车赛事蒙上了悲剧色彩。