Okay. So you have this concentrated light source.

好。所以你有这个集中。

Having a convenient light source changed people's lives.

便捷改变了人们生活。

Many light sources around us reveal secrets through the spectroscope.

我们周围许多通过分镜揭示秘密。

Because not a single light source had formed yet.

因为此时宇宙还没有形成单个。

“Real” colors are basically colors that can be produced by a physical light source.

“真实”颜色基本上是可以由物理产生颜色。

You have one shadow because our primary light source on Earth is our sun.

你只有一个影子，是因为地球上主要是太阳。

Other elements, like sight lines, mirrors, and light sources describe the moment through space and position.

其他元线、镜子和描述了当下空间和位置。

Rockefeller knows if he can frighten the public, kerosene will continue to be the dominant light source.

洛克菲勒知道 只要他能吓坏公众 煤油就能继续保持上统治地位。

With a convenient light source, people were able to work longer which led to even more technological innovation.

有了方便，人们就能够工作更久，从而带来了更多技术革新。

The astute among you might point out that it also matters a lot where the light source is.

你们当中精明人士可能会指出 ，位置也很重要。

Torches are just one of several light sources Stone Age artists used to navigate caves.

火把只是石器时代艺术家用来在洞穴中航行几种之一。

Martin Jotov says the result is a light source that can be produced in mass quantities on a sheet of plastic.

马丁·乔托夫说，这带来结果是人们可以在一片塑料上制造大量。

The train car turned pitch black as it barreled through a tunnel. Ember was the only light source in the train.

列车开进隧道，车厢里漆黑一片，小焰成了唯一。

Its angle means that it will reflect light from the light source towards our view.

它角度意味着它会将来自反射到我们野中。

I always start off by thinking, where is the light source, where is it coming from.

我总是从思考开始， 在哪里， 它来自哪里。

Which is replacing Thomas Edison's incandescent bulb as the the light source of the 21st century.

它正在取代托马斯爱迪生白炽灯泡成为 21 世纪。

Whether or not the light source is moving.

是否在移动。

Third, many plants live in environments where their leaves are not exposed to nighttime light sources.

第三，许多植物生活在叶子不暴露在夜间环境中。

We could also add a built-in light source to help students study at night or in low-light conditions.

ZZQ：我们还可以添加一个内置，以帮助学生在夜间或弱条件下学习。

In fact, you experience a closer light source as four times more powerful than that same light source twice the distance away from you.

事实上，你会觉得一个近距离比同样距离远一倍强四倍。