When crime scene investigators arrive at the place of a crime, they first try to make sure the area is secure.

VOA: special.2010.05.05

It is a Bronze Age culture, and it is the first civilization we know in the area.

这是一个青铜时代的文明,也是我们在此区域所知道的第一个文明

耶鲁公开课 - 古希腊历史简介课程节选

This is a research by one of the leading researchers, one of the first researches in the area of positive emotions, Alice Isen And she showed, time and again, how feeling good is good for us and good for others, and it works the other way as well.

一位重要的研究者，积极情绪领域的首批研究者之一，进行了这个研究，Alice，Isen。,她反复证明，感觉好如何对我们和他人都有益，反之亦然。

哈佛公开课 - 幸福课课程节选

The team was to create the first map of the area and find a possible path to the top of the great mountain.

VOA: special.2010.06.30

The first thing a passenger sees on the Cape May coast is the area's famous lighthouse.

VOA: special.2009.06.01

It usually first grows in a mole, a small dark area of skin.

VOA: special.2010.07.06