为什么车里的安全带总是一个好主意？

Cars are lots of fun, but they could also be dangerous. We have to be careful when we drive them or ride in them.

It's always a good idea to put on your seat belt when you're in a car. Why? Think about this example: You put an egg on a skateboard and give it a push. If the skateboard hits a stone, it will stop, but the egg won't. It will fly through the air, hit the ground and break.

Now, think what would happen if you tied the egg to the skateboard. When the skateboard hits a stone, the egg won't go flying; it will stay safely on the skateboard.

Volvo, a famous Swedish carmaker, was the first to use seat belts in 1849.

Air bags are also very important for car safety, because sometimes a seat belt isn't enough. If the car is going really fast and runs into something, seat belts could even hurt the people who wear them. Most new cars have air bags in front of and next to the seats. When a car hits something, its air bags will come out quickly in less than one second to keep the people inside safe.

汽车很有趣，但它们也可能很危险。 当我们驾驶它们或乘坐它们时，我们必须小心。  

当你在车里的时候，系上安全带总是一个好主意。 为什么? 想想这个例子:你把一个鸡蛋放在滑板上，然后推它一下。 如果滑板撞到石头，它会停下来，但鸡蛋不会。 它会在空中飞行，撞击地面，然后断裂。  

现在，想想如果你把鸡蛋绑在滑板上会发生什么。 当滑板碰到石头时，鸡蛋不会飞起来; 它会安全地留在滑板上。  

1849年，瑞典著名汽车制造商沃尔沃(Volvo)率先使用安全带。  

安全气囊对汽车安全也很重要，因为有时安全带是不够的。 如果汽车开得非常快，撞上了什么东西，安全带甚至可能会伤害到系安全带的人。 大多数新车的座位前面和旁边都有安全气囊。 当一辆汽车撞到什么东西时，它的安全气囊会在不到一秒的时间内迅速出来，以保证车内人员的安全。