Okay. So you have this concentrated light source.

好。所以你有这个集中源。

Having a convenient light source changed people's lives.

便捷源改变了人们生活。

Many light sources around us reveal secrets through the spectroscope.

我们周围许多源通过分揭示秘密。

Because not a single light source had formed yet.

因为此时宇宙还没有形成单个源。

Just think how much we rely on man-made light sources in our lives.

想想我们在生活中对人造源依赖程度。

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

你只有一个影，是因为地球上主源是太阳。

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

其他元素如视、和源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 只他能吓坏公众 煤油就能继续保持源上统治地位。

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

有了方便源，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 ，源位置也很重。

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源反射到我们视野中。

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源之一。

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源。

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，小焰成了唯一源。

Whether or not the light source is moving.

源是否在移动。

This tilting action would make sense if the strongest light source was in the sky.

如果最强源在天空中，这种倾斜动作是有意义。

After all,   for a closer light source it simply wouldn't be true.

毕竟，对于更近源来说，这是不正确。

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

我总是从思考开始， 源在哪里， 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 世纪源。

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

第三，许多植物生活在叶不暴露在夜间源环境中。