图片说明：随同插图或相片的描述文字；它解释或说明图片的内容。

Caption: the description accompanying a photo or illustration, which explains or identifies the content.

youdao

上面的图片说明了什么？

What does the picture above show?

youdao

图片下边附有说明。

There is a caption under the picture.

《新英汉大辞典》

We receive the electric signals from each tip, we tell which neuron is listening to, we get that color piece.

我们从每个电极端接收到电子信号，我们说明去听哪个神经元，这样就得到了一张彩色图片。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Here's another picture of it here, showing it in a little bit more detail, that you have lots of DNA in each of the cells in your body but you're not using all that DNA at any one time.

这里有一张更加详细的图片,来说明这一点,人体内每个细胞中都含有大量DNA,但并不是所有的DNA都会同时发挥作用

耶鲁公开课 - 生物医学工程探索课程节选