"Then you see the need to prevent this joining?"

No need to prevent them from thinking; nature has done that.

She couldn't explain that the need to keep the room sterile prevented her from bringing in a television set.

First, the need to prevent the Boers from occupying the mountains of the area.

The needs of the course of justice prevent me from elaborating further now.

However, the need to transform these cells with an oncogene may prevent the use of this approach in therapy.

The need to obtain timely results may prevent extending the frame far into the future.

They highlight the need for regulatory changes to prevent a recurrence.

The authorities sense a need to prevent the next generation from getting into this.

While generally decorative, their particular tropical needs have prevented much widespread cultivation.