You may think it an innocent joke to drive away another person's car but in the eyes of the law it is theft.

你也许认为把别人的车开走是开个不打紧的玩笑,但从法律的观点看来,这是偷窃.

《简明英汉词典》

There is no hurry . The matter is not urgent.

这件事不打紧,你不用急.

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If the air bags don't deploy it doesn't matter, because our cars are so beefy.

如果气囊打不开,那也不打紧, 因为我们的车肉头一样地耐撞.

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