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       1.描述

　　It is clear that the most (adj.) xx is A， which accounts for m% of all x . B is the next largest(adj.)xx ，n% lower than A of all x and followed closely by C . The above three items of xx take uo about o% of the x%

　　By contrast D E andF make uo the smallest percentage of total x ， which are p% q% and r% ，respectively.

　　The regions can be divided into two groups-one where … and the other where the reverse is the case.

　　2.比较，占据，百分数

　　Form， comprise， make up， occupy

　　Constitute， cover， represent， account for

　　Be shared by

　　In 1950， the urban population represented less than 13% of the total. It is now about 40% and is expected to reach 60% by 2030. (摘自BBC)

　　3.比例，倍数

　　A quarter of…

　　Half of…

　　A majority of…

　　A has something in common with b

　　A shares some similarity with b

　　The difference between a and b lies in…

　　Double， triple， quadruple (v， n， adj)

　　原来的2倍-double， 50→100

　　原来的3倍-triple， 50→150

　　原来的4倍-quadruple， 50→200

　　The value of the house has increased fourfold (=it is now worth four times as much as before).

　　…be twice as adj. as …..

　　…more than xx times as adj. as …..