An advisory for ashfall - which can contaminate water supplies, kill vegetation and irritate the lungs - was in effect for the surrounding area overnight but has since been lifted.

In recent years, to get a certificate Why does this craze appear?

Now the income gap is getting wider and wider. In some privately owned firms, joint-ventures, or foreign-fund companies, an executive's yearly income is ten times or even a hundred times as much as an ordinary worker's.

It can be seen from the graph that great changes have taken place in the number of training classes in the past fifteen years. On the one hand, before the 90s, the increase of the training classes was not so great. On the other hand, there has been a sharp increase in the training classes after the 90s.