Researchers are optimistic that pulse detonation engines will revolutionize high-speed air travel by offering greater efficiency and simpler construction.

She painted the old bicycle fire engine red to make it stand out.

Everyone admired the fire engine red of the vintage car at the show.

The artist mixed several fire engine reds to match the vintage truck.

The technician inspected the East-West engines before the test flight.

Our startup invested heavily in search engine optimization to increase organic traffic and reach more customers.

Mechanics prefer four-stroke engines for their reliability and fuel efficiency.

We rewrote the site content to be search-engine-friendly, improving our organic traffic within weeks.

Many vintage motorcycles still use two-stroke engines for their lightweight power delivery.

Before the new signalling system was installed, the branch was worked as one engine in steam, so only one locomotive could occupy the single-track section at a time.