Most people understand we need clean air and water for our physical health.

We need clean water and air, but for the rest of their regulations, they could go.

Particularly difficult species may need cool air above and warm soil.

But the kind of sailing ship I have in mind won't need air or water.

Don't push yourself and you won't need as much air.

But not because they knew that men need space and clean air, Jason thought.

Like, I might decide that you don't really need air up there.

"We need fresh air, and I for one want to see what's going on up there."

Eventually we needed air "You're sure you don't want to come in?"

Plants and animals also need air to live: it is very important to everyone.