fly a flag at half-mast是什么意思，fly a flag at half-mast的翻译，fly a flag at half-mast音标、读音、用法和例句

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fly a flag at half-mast是什么意思，fly a flag at half-mast的翻译，fly a flag at half-mast音标、读音、用法和例句_淳朴汉英词典

fly a flag at half-mast

基本解释

专业释义

地球科學