1.settle into 有头绪，上正轨

We'll launch the weapons the moment they settle into orbit.
一进入轨道，我们就发射武器。

To settle into your new house.
适应你的新住宅。

2.able to 能；会

He was even able to build his own home.
他现在甚至能建一所自己的房子。

How fortunate that he had been able to love!
能爱别人是多么幸运的一件事！

3.account for 说明；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。

4.rely on 信赖； 依赖；依靠

We rely on corporations like bp to bring us energy.
我们依靠像bp这样的公司来供给我们能源。

The firm cannot rely on reputation forever.
弘毅不可能永远依赖其名声。