How to pronounce “unpaired” in English

Even in their earliest forms, they could already make 150 meters of zippers per day, and these zippers were incredibly strong.That's because for a tooth to become unpaired, it needs to get some distance between itself, and its neighbors, enough for the nibs on either side to pop out.But since the machines spaced the teeth so precisely, there was simply no room for that to happen.

And these can help us detect how the NV center responds to a magnetic field.At first glance, it looks like the nitrogen vacancy generates a few unique levels, and these are exclusive to the two unpaired electrons trapped within the defect.But if you look closer at, for example, the lowest level, you'll notice that it actually contains three closely spaced but separate energy levels.