1.focus on 致力于；使聚焦于

That's all you want to focus on.
你只需将你的注意力集中于此。

The project also will focus on key secreted pathogenic proteins.
该项目也将集中于主要分泌性致病蛋白质。

2.according to 根据，按照

They both played the game according to the rules...
他们俩都依章行事。

They must take their own decision according to their own legal advice.
他们必须根据各自律师的意见自行决定。

3.tend to 趋向；偏重

Smaller laptops also tend to have longer battery life.
小巧的电脑也趋向更长的电池持续时间。

I tend to prefer light colors.
我往往更喜欢淡颜色。

4.account for 导致，引起

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？

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。