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Electricians at work on an airport runway in Ontario, Calif. Frequent outdoor work, regardless of the weather, is a feature of the career. Watchara Phomicinda—MediaNews Group/The Press-Enterprise/Getty Images
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Antarctica has lost 10 times the size of Greater Los Angeles in ice over 30 years. The ice sheet has been retreating from the grounding line at an average rate of 442 square kilometers per year.，推荐阅读体育直播获取更多信息
# Output: {'user': [{'username': 'john_doe'}]} # Only valid usernames