This shows navigators the direction of north, and therefore also south, east and west.

VOA: special.2010.07.14

Now, just--what this diagram also shows you is that that response is specific to that particular antigen.

看,就像这幅图表展示的一样,免疫应答是针对特定的抗原

耶鲁公开课 - 生物医学工程探索课程节选

The movie also shows how climate change is threatening this ecosystem.

VOA: special.2009.03.25