As can be seen clearly in the chart, the average number of hours a student spends on Internet every week has increased from 2 hours in 1998 to 8 hours in 2006.
如果是最常见的是2*3的情形，
According to the information implied in the chart, we can see clearly that in a big city in China, state owned houses declined from 75% in 1990 to 60% in 1995 and then to 20% in 2000, while private houses rose from 25% to 40% and then to 80% during the same period.
it is universally known that the above-mentioned chart truly demonstrates a social issue which is becoming more and more popular currently. What prove to be the underlying reasons for it? Without any doubt, 3 reasons stated as follows can be adopted to account for it. First and foremost,(阐释具体的现象或原因)more importantly, (阐释具体的现象或原因)，last but not the least.(阐述具体的现象或原因)
To sum up, in order to maintain such a sound momentum, a number of great efforts should be made to take some effective measures in this regard, on the one hand,具体的措施，on the other hand，具体的措施，only in this way, can this momentum be kept smoothly, (如果以上说的是好的趋势) Generally speaking, in order to put an end to this bad momentum, some compelling measures should be taken into account, on the one hand,具体措施， on the other hand,具体措施， only if we have taken the above-mentioned measures ,can this momentum be curbed effectively.(如果以上说的是不好的趋势)