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Yemen's aviation authority says it is tightening security at all of its airports.
也门航空管理局说，它加强了所有机场的安全防范。
youdao
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China's civil aviation authority yesterday raised security levels at airports.
昨日起中国民航提升机场安全级别。
youdao
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China's civil aviation authority yesterday raised security levels at airports.
昨日起中国民航提升机场安全级别。
youdao