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n accident in which a vehicle hits something, for example another vehicle, usually causing damage and often injuring or killing the passengers A girl was killed yesterday in a car crash. a place where an army, a navy or an air force operates from。 the main place where you live or stay or where a business operates from After the attack, they returned to base. The pany has its base in New York, and branch offices all over the world. a liquid obtained from petroleum, used as fuel in car engines, etc. think carefully about the different possibilities that are available and choose one of them It’s up to you to decide. I can’t decide what to wear. She decided (that) she wanted to live in France.