Why are essays that refer to "Three Sisters" as "The Three Sisters" posted here? Is that not a sign of a lack of research?
It is not any sort of nefarious intent nor is it a lack of research. What you see as a problem here is simply a choice of the translators from Russian to English. Some translators prefer to use the article "the" while others stay truer to the original language by omitting the article. I do not speak Russian, so I will leave it to another to further explain the choices made as a translator makes his or her decisions.
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