She smiled hollow-heartedly as she handed back the ring, knowing the love was gone.

The hollow-fibre membrane provided superior filtration in the laboratory experiment.

The hollow-fiber membrane significantly increased the filtration efficiency in our pilot plant.

The laboratory tested a new hollow-fiber membrane for improved water purification.

The research team examined a hollow-fibre under the microscope to study its porosity.

To master the roll, she focused on keeping a tight hollow position throughout the movement.

As an alternative form of hollow body position, the coach taught the hollow body to help gymnasts engage their core safely.

The restoration team carefully examined the hollow post mill to determine whether its bored main post could still support a new driveshaft.

The preservation group organized guided tours of the old hollow post mills along the coastal path.

Gymnasts practice hollow body positions to improve core strength and body control.