The excessive use of any electricity-powered machines like air conditioners will accelerate global warming, raising temperatures." said Lee Boon-ying, director of the Hong Kong Observatory.

过度使用空调等电器将加速全球变暖进程，导致温度升高。

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When a typhoon is expected to land in Hong Kong, the Hong Kong Observatory is prepared with a comprehensive alert system that issues hourly summaries of weather warnings through the news and radio.

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But in Hong Kong, which has comparable tropical weather patterns to Indonesia, nearly one in 500 arriving and departing flights have reported significant wind shear at the international airport since its opening in 1998, according to the Hong Kong Observatory's website.

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At the moment Dr Haller, who is now at McGill University in Montreal, is collaborating with Wenbo Tang of Arizona State University and Pak Wai Chan of the Hong Kong Observatory to apply Lagrangian theory to the problem of aircraft taking off and landing in difficult circumstances.

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