Sustainable land management and development is an essential key to reducing the negative impacts felt by landslides.

"I've come to see the essential key to the Yancy character," says Sipling near the end of the story.

Continuous development of new technologies has always been an essential key for the survival of the human species.

It is an essential key for achieving high levels of profit consistently.

As the article states, one of the essential keys to our human musical ability is not absolute but relative pitch perception.

Therefore Saturn's power of measurement was probably the essential key to existence itself.

This is the essential key to his art, whether one agrees with it or not.

A primary way to learn about patients is to know what they value, as values are essential keys to personality structures.

The member you so kindly donated is my essential key to all of these.

He was still missing some essential key.