How do umbrellas work?

Related questions

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6. Can UV rays penetrate an umbrella?
7. What is the best UV umbrella?
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Tags

1. #shaft
2. #metal
3. #circular
4. #stretched
5. #umbrella
6. #patio
7. #material
8. #waterproof
9. #springy
10. #principle
11. #stretchers
12. #umbrellas
13. #emergency
14. #purse
15. #attach
16. #small
17. #versions
18. #little
19. #enough
20. #would
21. #without