31. there is not a great deal of differencebetween...and...
...与...的区别不大。
32. the graphs show a threefold increase in thenumber of...
该图表表明...的数目增长了三倍。
33. ..decreased year by year while...increasedsteadily.
...逐年减少，而...逐步上升。
34. the situation reached a peak(a high point at) of [%].
...的情况(局势)到达顶(高)点，为...百分点。
35. the figures/situation bottomed out in...
数字(情况)在...达到底部。
36. the figures reached the bottom/a lowpoint/hit a trough.
数字(情况)达到底部(低谷)。
37. a is ...times as much/many as b. a是b的...倍。
38. a increased by... a增长了...
39. a increased to... a增长到...
40. high /low /great /small / percentage. 比低高(低)