Help with Grade 8 science?

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Here’s an exerpt from my textbook which i dont get AT all. Can you tell me what they’re syaing T_T “Fluids move naturally from an area of high pressure to low pressure. Consider the simple example of drinking juice from a juice box. The motion you make when you drink with a straw removes air, creating an area of low pressure in your mouth [HUH?!]. As a result, the relatively higher pressure of the surrounding atmosphere pushes the juice into your mouth. If the air inside of a closed container is at a lower pressure than the air pushing on the outside of the container, there is an unbalanced force. You may have noticed this imbalance when drinking juice from a juice box. The straw makes such a tight seal that as you draw the juice up the straw and reduce the air pressure inside the juice box, the box buckles inward. The air pressure outside the juice box pushes the walls of the box together. When high pressure air moves to an area of lower pressure we can take advantage of its force to drive all sorts of mechanical devices and to carry, push or move objects. WHHHHAAAAT??!?!!?

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http://answers.yahoo.com/question/index?qid=20090427213808AA9b3jR