By preaching to the converted, she reinforced the volunteers' commitment before the big campaign.

The research team developed a compact ferroelectric converter capable of producing electricity directly from low-grade heat.

After presenting the climate data, he realized he had preached to the converted and switched to discussing concrete solutions.

I bought several ink converters to try different bottled inks in my fountain pens.

Before the trip, I fitted an ink converter into my fountain pen so I could use bottled ink instead of carrying bulky cartridges.

The engineer inspected the Bessemer converter before the next steelmaking run.

Bessemer converters revolutionized steel production in the 19th century, allowing manufacturers to produce large quantities of steel rapidly.

To receive over-the-air channels on our antique television, we installed a digital converter box.

Many households needed digital converter boxes after the analog TV shutdown.

Researchers measured the activity of angiotensin converting enzymes in patient blood samples to evaluate cardiovascular risk.