Please translate these sentences into Chinese,many thanks~

Please translate these sentences into Chinese,many thanks~
1 This movement of air feeds storms and helps produce tornadoes and hurricanes.这句话中“FEED”一词什么意思?
2 Press the bag against the inside of the jar
3 The bag doesn't come out because the air pressing down on the inside of the bag is a lot greater than the little bit of air that is pressing up under the bag between the bag and the jar
4 fill a plastic cup to overflowing with water
5 keep one hand on the card as you flip the cup over
6 The air pushes up on the card enough to hold the water in place
7 tie each of them to a separate piece of string and hold them by the strings so that they're a couple inches apart.