The appearance of oxygen and pressure relief valve works.
氧气减压阀的外观及工作原理。
The organisation works to administer charity and relief in the area.
该组织负责这个地区的慈善救济事宜。
United Nations Relief and Works Agency for Palestine Refugees in the Near East
联合国近东巴勒斯坦难民救济和工程处
Advisory Commission of the United Nations Relief and Works Agency for Palestine Refugees in the Near East
联合国近东巴勒斯坦难民救济和工程处咨询委员会
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