1.有用的词

　　上升：increase rise ascend core surge go up climb mount level up

　　下降: decrease fall drop descend decline reduce lessen level down

　　平稳:stable steady remain/maintain/keep/be the same as/similar to

　　波动:fluctuate fluctuation rise and falls up and down

　　占:occupy take up account for gain

　　而:while however whereas on the other hand actually/in fact

　　相比:by contract on the contrary likewise compared with

　　点:the highest the top the summit the peak the most

　　点:bottom less least rock bottom

　　平均:mean average

　　趋势:tendancy trend inclination

　　预见:prediction

　　达到顶峰: mount to

　　在***中占***:***gain the percentage of

　　有一个稳定的过程:a stable period can be seen