For constant strain, physical and mental, I recall no such four days during the whole of my adventurous life.

This is the reason why rubber under constant strain shrinks when its temperature increases.

She never understood how they could take the constant strain.

It is a constant strain from morning till night.

How could she explain the constant strain of wondering which critical system would fail next?

How many people could have been under such a constant strain, for so long?

"I cannot bear the thought of the constant and terrible strain upon her poor eyes which I fear will come with our new studies."

It's not so difficult when you're tired, and under a constant strain.

Kalita's eyes softened, and for the first time he saw she was struggling with her life, no doubt brought on by the constant strain.

Harold's patience began to give way under the constant strain of self-suppression.