The picture showed a ship about 30-yards long with a rather narrow diameter.

Using duct with a narrower diameter would restrict the airflow.

Looking up, she saw George squeeze his bulk through its narrow diameter.

The vent pipes were cylindrical and of a narrow enough diameter that he was able to hold on to each one securely.

If the soil is plastic, this thread will retain its shape down to a very narrow diameter.

To be accurate, the lens itself is of a narrow diameter, giving a very small overall aperture.

The narrow internal diameter results in a much higher velocity than would occur inside conventional tubing or inside the casing.

They have a narrower diameter and are more elongated compared to sieve tube members.

On acceleration, for instance, the drive pulley will have a narrow diameter for more torque, like a low gear.

No longer content to simply drift, they were moving back and forth across the narrow diameter of the tunnel.