It is obvious in the chart that the amount of ___________________ has undergone dramatic changes. In recent years, _______________.
Mainly there are three reasons behind the situation reflected in the chart. First of all, ______________________. More importantly, _____________________. Most important of all, _
From the above discussions, we can reasonably predict that the trend described in the chart will continue for quite a long time. Accordingly. __________________.
The Increase of Aging Population
As the chart shows, during the years of 1999 to 2009, the aging problem in china is becoming more and more of a one in the society. As early as 1999, the aging accounted for(构成比例，占有) only 5% of the whole population. Then six years later, 2005 witnessed a dramatic rise in the number of the aging, 15% of the total. And arriving in the year of 2009, the ratio has become one to four（1:4即，一比四）.
Several factors contribute to the aging problem. Firstly, the decreased birth rate出生率下降is one of the major factors for this phenomenon. Secondly, the improvement of medical technology prolongsvt. 延长；拖延
people’s life span(寿命). Thirdly, with the living standard rising, people’s sense of healthcare(保健意识) has changed greatly and more and more do exercise to improve thEir physical and mental health.浙江飞鱼彩票联盟浙江飞鱼彩票
However, the aging population is faced with some problem. With the quickening step of development, world population will be becoming denser,adj. 密集的；浓厚的（dense的比较级)
the effect of which is not only discouraging, but also challenging. 不仅是消极的,但也是挑战性的Therefore, it is an urgent adj. 紧急的；急迫的thing for us to make great efforts to arouse public attention and adopt effective measures to help those senior citizens（老龄公民）.