1.close down 关闭

例句:The library had to close down for it was too late.
天太晚了，图书馆得关门了。

2.as soon as 一...就

例句:As soon as I had made the final decision, I felt a lot more relaxed.
我一作出最后的决定就感到轻松多了。

3.business relations 商业关系

例句:They have business relations with our firm.
他们和我们公司有生意来往。

4.In short 简而言之

例句:In short, it's possible that you hear the words and pay no attention to the content.
简短来说，你可能听到了他的谈话但是并没有注意它的内容。