Nowadays, if we go on the street, we can find that fast food is everywhere, the reason why the fast food is so popular lies on that it is convenient. People can finish their meal quickly and spend more time to do work. Fast food indeed saves people a lot of time, but it is not good for our health, we should not eat it often. 现在，如果我们走在街上，可以发现到处都有快餐，快餐流行的原因在于它方便。人们可以快速吃完他们的餐，花多点时间去工作。快餐确实可以节省人们很多的时间，但是那对我们的健康也不好，我们不应该常吃快餐。