Is it humane for us to drive these beautiful animals to their physical limits when a mere misstep may mean death?

Topaz blushed with pleasure at the unexpected praise, but she still went on driving herself to, and beyond, her limits.

Driving her crew to their limits, Sorus Chatelaine had brought Soar by great leaps to the Lab.

On 8 May South Georgia was sighted, after a 14-day battle with the elements that had driven the boat party to their physical limits.

When driven to their respective limits, tubes and transistors distort quite differently.

Rap had driven himself to his utmost limits and failed to receive acknowledgment for it.

Only in Asia Minor, where the king's cousin, Achaeus, represented the Seleucid cause, did its prestige recover, driving the Pergamene power back to its earlier limits.

But Tarvi was back at Karachi, extruding metal sheets on a round-the-clock basis, slaving as hard as the people he drove to their limits.

People were driven to their limits.

Tracchia was now driving the car close to its limits and he had almost to shout to make himself heard.