I trust it is not difficult for the American people, who went through the American Civil War in their history, to understand how important and valuable unity is to a nation.

相信经历过南北战争的美国人民，不难理解统一对一个国家多么重要和珍贵。

youdao

When people bought this convenience, what they were really buying was Polyethylene Terephthalate, or PET, the single most important innovation in the industry's history.

消费者购买的所谓便利不过是聚对苯二甲酸乙二醇酯（PET）——工业史上极为重要的发明之一。

youdao

This term, for example, her class is learning about people important in history.

比如，这一学期，她的班级就在学习历史上的重要人物。

youdao

So tasking them with this most important mission in our recent history is something that I think people are optimistic about.

BBC: Transcript of Hatem Seif el Nasr interview

Professor Rona Mackie, an expert in skin cancer from the University of Glasgow, said it was important that people with a family history of melanoma did not panic.

BBC: Twins offer skin cancer clue

In the case of ADD it is important that the history be taken from at least two people, such as parent, teacher, and child, or adult and spouse, since people with ADD are not good at observing themselves.

NPR: Excerpt: 'Delivered from Distraction'