To generate lift, a bird has merely to tilt its wings, adjusting the flow of air below and above them.

为了产生抬升力，鸟儿们只要倾斜翅膀，对从身体上方和下方通过的气流稍作调整。

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Ensure there is a free flow of air around the machine.

要确保机器周围空气畅通。

《牛津词典》

A constant flow of air keeps the plants bathed in carbon dioxide.

室内空气保持不停流动，确保作物随时“沐浴”在二氧化碳之中。

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The doctor says you should point the device so the flow of air is just in front of your face.

VOA: special.2009.07.14

It provides a continuous flow of air into the throat and lungs while the person sleeps.

VOA: special.2011.05.04

Finally,leave space between the food containers and the walls of the cold storage area so air can flow.

VOA: special.2009.11.30

The ice adds weight to an aircraft, and rough accumulations known as rime interrupt the flow of air over wings.

WSJ: NTSB: Pilot action, icing led to NJ plane crash

Once the home has been duly sealed, the flow of air, moisture and heat in and out of it can be carefully controlled.

ECONOMIST: Green homes

The company has worked with Boeing to develop a system that uses multiple workstations to simulate the flow of air over an aircraft's wing.

CNN: Intel demos Pentium 4 at 2GHz