They make contact with the non-metal part of an electric circuit (those protein wires).

与电路中的非金属部分（那些蛋白质丝）。

I just didn't, don't think I, when we talked about that salt is a broader category of just what you said, a metal on a non-metal, I don't think I've wondered then do they taste salty.

只是没有， 没想到当讨论盐是个比你说的更广泛的类别时，个金属与非金属的结合， 不曾想过它是否会有咸味。

Was clay the greatest non-metallic material that they had, or the material that they had that they were able to create this extraordinary, very sophisticated artwork from?

陶土是他有的最伟大的非金属材料，还是他能够创作出这些极其精美的艺术品的材料？

Covalent bonds tend to form from non-metals and sometimes metalloids, those elements that have both metallic and non-metallic characteristics.

共价键往往由非金属元素以及有时由类金属元素（即同时具有金属和非金属特性的元素）形成。

So a salt is a metal plus a non-metal, and it typically is what we would call an ionic bond.

所以，盐是由金属和非金属组成的，它通常形成所说的离子键。