这是非正式的用法,口语里常见。正规书面用法里应当是 There are rules...
语法网站上有如下解释:
Note that in everyday English, many people use there's with a plural subject:
There's two boys in the garden.
There's two boys and a girl outside.
There's a lot of dogs in the street.
This is increasingly common in British and American English, but it is not recommended in formal situations.
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