(lip-die-tooth-cold)

If you translate the idiom literally, it says, "If the lips die, the teeth will be cold." It means, "Without the protection of the lips, the teeth will suffer coldness because of exposure." It symbolizes two important things are co-dependent and inseparable. If either one of them suffers, both of them will. So, we cannot have one but not the other _ we need them both. Actually, we not only must keep both alive, but also must keep them healthy. Neither of them can be sacrificed.

Let's see if I can give you a sample sentence. Both beer and pretzels are absolutely essential to Engineering Science students: if we don't have any beer, the pretzels won't taste the same, and if we don't have any pretzels, the beer won't taste the same as well. So, beer and pretzels are in a

situation: we need both of them and we hate to see losing either one of them.

It is a wonder how my mind works at 2 o'clock in the morning: I don't drink and I actually thought of using beer and pretzels as an example. Anyhow, it's your turn now: substitute beer and pretzels for something else, and you get a new sentence. Try using things around you: binders, jobs, books, pens, erasers, rulers, calculators, oscilloscopes, pencil, paper, etc. Think about this carefully.

Like I said, the light bulb was dim. So, I am not sure if I have achieved what I wanted.