PTELook at the text below. In 35 seconds, you must read this text aloud as naturally and clearly as possible. You have 35 seconds to read aloud.

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To withstand the forces of nature and the huge forces the rotation itself generates, blades are manufactured with a multilayer ‘ coat of armour ’. Typically, the outer layer erodes during operation and the inner layers can become detached. Although the lifespan of a turbine is theoretically 25 years, current medium-sized systems typically require extensive maintenance at about 10 years due to blade deterioration.

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