2010年9月21日，一场特大洪灾发生在茂名市，据说是该市有史以来最大的洪灾。的翻译：On September 21, 2010, when a catastrophic flood occurred in Maoming city, is said to be the city's largest-ever flooding. 什么意思？中文翻译英文，英文翻译中文，怎么说？

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On September 21, 2010, when a catastrophic flood occurred in Maoming city, is said to be the city's largest-ever flooding.

On September 21, 2010, an especially big flood disaster occurs in Maoming city, it is said is this city throughout history biggest flood disaster.

September 21, 2010, a devastating floods occurred in Maoming city, is said to be the biggest ever floods.

On September 21, 2010, when a catastrophic flood occurred in Maoming city, is said to be the city's largest-ever flooding.