In the simple diagram below, we can see that the light source is coming from the left.

下图中，光源来自左方。

youdao

We can't see anything unless we have a source of light.

除非有一个光源，否则我们无法看到任何东西。

youdao

Also can find the source of strength, also will see the light in the dark, not lost in the direction of life.

也能找到力量的源泉，也一定会在黑暗中看到光明，不会迷失生活的方向。

youdao

So, we would expect to see electrons ejected with the UV light source.

所以，我们能够预测,可以看到电子被紫外光源射出。

麻省理工公开课 - 化学原理课程节选

The reason for this became clear, Osterhaus and the big Pharma did not want this alternative source strategy to see the light of day as there were not the billions upon billions in drug sales.

FORBES: H7N9 Bird Flu Cases Rise To 49, Deaths At 11 In China; Beijing Shuts Poultry Markets