Q20. What were the dolphins supposed to do when they saw a steady light?

问题20. 海豚看到持续的时候该怎么做？

Illumination came from a roaring fire beneath a handsome marble mantelpiece surmounted by a gilded mirror.

大理石壁炉里熊熊的火焰是房间内的唯一，壁炉的上方有一面镀金的镜子。

They are lit on birthday cakes and to mark family anniversaries, when we gather happily around a source of light.

例如蛋糕燃点蜡烛，一家人聚在一起庆祝生日或家庭纪念日，绕着，满溢欢欣。

It gets the light it needs from a kind of light bulb called an LED.

它通过一种叫做 LED 灯的就能获取所需的线。

Filming just by the light of the moon will test the crew to their limits.

用月色作为挑战者团队的极限。

In the days before electricity, candles were a main source of light for work.

在没有电的时代，蜡烛是工作时的主要。

Okay. So you have this concentrated light source.

好的。所以你有这个集中的。

The Giant Magellan Telescope will be sighted in the Chilean Andes and the sharpest images in Chile, dry weather, clear skies and no artificial lights.

巨型麦哲伦望远镜将会被建在安第斯山脉下的智利。它的成像无比清晰，得益于智利干燥晴朗的天气以及没有人造污染。

I think you've got to have as many light sources in a room as possible.

房间里越多越好。

Having a convenient light source changed people's lives.

便捷的改变了人的生活。

And I'm a natural source of light.

是自然的。

They decided to use a different source for background light.

他决定使用不同的作为背景。

Many light sources around us reveal secrets through the spectroscope.

周的许多通过分镜揭示秘密。

And that's because the light is always reflecting back to the source.

这是因为总是反射回。

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

你只有一个影子，是因为地球上主要的是太阳。

The most important source of light here on Earth is the Sun.

地球上最重要的就是太阳。

I actually have icons of lights I move around in there.

有的图标能够在里面移动。

The technology works only when the LED's light can reach the gadget.

这项技术只能仰仗LED这个小装置的。

Artificial light is not something most people would instantly recognize as a harmful pollutant.

人工并不是大多数人一眼就能认出的有害污染物。

It didn't have any gadgets or lights or hidden compartments.

这块盾牌上并没有任何配件、或是隐藏装置。