Sentence examples for ones are difficult from inspiring English sources

Higher ones are difficult to stifle electronically.

Unlike flexible consequences, rigid ones are difficult to imitate because companies need time to build them.

Consequently, comparisons between living forms and Paleozoic ones are difficult, and problems have arisen in classification as well as understanding the interrelationships between past and present forms.

Some of the models cannot predict composition dependence properly or are limited to a narrow composition range, while more exact ones are difficult to use because of their complexity.

"I see a lot of opals and good ones are difficult to replace," the elder Athanasiadis said.

Blue hues could belong to the under painting layer in light of the blue areas visible through the thin surface painting layer in different areas of the background (see Fig. 8) but the pink ones are difficult to locate.

So optimising existing machines or designing new ones is difficult and expensive.

But pulsars weren't discovered in globular clusters until the early 1990s, and finding new ones is difficult because of the unknown "smearing" of pulses by the interstellar medium.

Either one is difficult on its own, but doing both can be a challenge.

This one is difficult to assess, and I generally go by gut instinct on meeting with the founder.

But this one was difficult.