They were too naive to understand the necessity of studying.

He was convinced of the necessity of learning it.

The fuel shortage awoke the country to the need for developing atomic energy.

About 50 percent of the firms in Japan have acknowledged the necessity of giving their workers longer holidays, and think summer holidays are needed to give their workers both mental and physical refreshment.

The two felt the pressing necessity of earning a livelihood.

Women no longer are satisfied with their traditional role of housewife, and are seeking recognition of needs in the workplace.

We understand the necessity of studying.

It is only recently that people have begun to realize the importance of nature conservation.

The world today needs to advance its production of food.

There was, however, a need for food to be carried from the bowl to the mouth, and chopsticks came along to meet that need.