1. Melted ash can then congeal on the blades and block the normal flow of air, causing engines to lose thrust or shut down.
2. This is because the left surface of the ball is moving against air flow.
3. The effect is the result of putting buildings too close to one another and reducing air flow.
4. Cathay is the world's largest air cargo carrier and its cargo flow is a good indicator of southern China and Hong Kong's export growth.
5. Snoring results from an obstruction to the flow of air through passages at the back of the mouth and nose.
6. A flow of cold air hit western Gansu on Saturday night, bringing heavy snowfall to the Qilian mountain area.
7. Due to the flow of strong cold air, many regions of Guizhou Province were hit by freezing rain and sleet recently.