四千人在布达佩斯呼吁整治多瑙河，手持绿色雨伞以强调环保行动的必要性，此活动为一联合会议的一部份。
As part of a joint conference, 4,000 people appeal for the Danube's cleanup in Budapest, carrying green umbrellas to highlight the need for environmental action.
四千人在布达佩斯呼吁整治多瑙河，手持绿色雨伞以强调环保行动的必要性，此活动为一联合会议的一部份。
As part of a joint conference, 4,000 people appeal for the Danube's cleanup in Budapest, carrying green umbrellas to highlight the need for environmental action.
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