account for 和make up百分数的用法

account for
有“说明、解释…原因,对...负有责任,占有,占...百分比”等含义.
做“占...百分比”解释,表示占有一定比例含义,多接分数,如一半、1/5等,当然也有接百分数的情况.
APEC members account for more than half of the world's economic output.
亚太经合组织成员的经济总量在世界占一半以上.
Petrochemicals today account for one fourth of all the chemicals made, in ten years this amount is expected to double.
石油化工产品现在已占所有化学制品的四分之一,十年后预计这个数目还要加倍.
make up 含义较多,有“弥补、组成、化妆、整理”等含义.
但本意是“组成、构成”,有一个物体由几部分拼凑、连接而成的含义,相当于 compose.
Farming and mining make up most of the country’s industry
The medical team was made up of twelve doctors.
The boy students in our class make up two fifths of the whole students.
take up没有占多少百分比的意思　
主要含义：开始从事、占去时间（花费时间）、占去空间、拿起等
　When did he take up football?
　The work took up all his time.
　The piano takes up too much space.
He took up arms and rushed out.