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可尝试扩展句子。越复杂的句子,分析结果越丰富。
About four metres long, the room served as a small reception hall for important visitors.
因为只含有一个主谓结构,并且句子各成分都只由单词或短语构成,所以它是一个简单句。
the room主语
served as •••谓语动词短语
a small reception ··· visitors.宾语
About four metres long,