He can speak several dialects.
No one wants to learn six different dialects of a query language and then relearn it every six months.
"He speaks Portuguese, [three Chinese dialects] and English," she bragged in Mandarin, adding that her own Cantonese, the prevalent dialect in Hong Kong, and English were limited.
Singlish is a jumble of the nation's four official languages -- English, Mandarin, Malay and Tamil -- and vocabulary from several Chinese dialects.
You cannot speak any of the necessary dialects, and when you make a stupid remark its stupidity will be obvious, even to yourself.
A good text editor for working with XML will have syntax highlighting that is generic for all XML dialects, and also probably the option of configuring something more specific for a given dialect.
Nobody knows exactly how many languages there are in the world, partly because of the difficulty of distinguishing between a language and a sub-language (or dialects within it).
