account for a great proportion in ....
account for
英 [əˈkaunt fɔ:] 美 [əˈkaʊnt fɔr]
【释义】说明（原因、理由等）;导致，引起;（在数量、比例上）占;对…负责
【英英释义】verb
1、give reasons for
Can you account for all these absences?
2、be the reason or explanation for
The recession accounts for the slow retail business
【双语例句】
1、Now, the gene they discovered today doesn't account for all those cases.
不过，他们现在发现的基因无法解释所有的病例。
2、How do you account for the company's alarmingly high staff turnover?
你怎么解释这家公司高得令人忧虑的人员流动率？
3、The President and the President alone must account for his government's reforms.
总统必须为他的政府改革负责，而且是负全责。
4、The really heavy redundancy costs have been accounted for.
非常庞大的裁员开支已被列入预算。
5、He said only 200 of the train's 600 passengers had been accounted for.
他说火车上的600名乘客中仅有200名乘客的信息得已查明。