If there exist a product that can wake you up naturally, will you purchase it?
如果有产品可自然的睡醒，你会选购吗？
If there did not exist some one who loved, the sun would become extinct.
人间如果没有爱，太阳也会灭。
If there were no air and water, people could not exist.
如果没有空气和水，人就不能生存。
If there is no disease in the world, there would be no need for the medicine to exist.
如果世界上没有疾病，那当然就不需要医生。
So we can say if there is no learning, our happy life will not exist.
可以说，没有学习，就没有我们人类今天的幸福生活。
So we can say if there is no learning, our happy life will not exist.
可以说，没有学习，就没有我们人类今天的幸福生活。
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