Okay, the user wants me to translate "more rigorous" into Russian. Let me check the rules again. The first rule says to translate all content into Russian. The second rule states that if the content is already in Russian, leave it as is. The third rule is to provide only the translation without any explanations.
So, the input here is "more rigorous". I need to translate this into Russian. The word "rigorous" can be translated as "строгий" or "строгое" depending on the context. Since it's an adjective, and the original is "more rigorous", which is a comparative form, in Russian, the comparative of "строгий" is "строже". However, sometimes "более строгий" is used for "more rigorous". Wait, but "строже" is the comparative form, so maybe "строже" is more accurate here. Let me confirm.
In Russian, "строгий" (strict) can have its comparative as "строже" or "более строгий". Both are correct, but "строже" is the short form, while "более строгий" is the full form. The user might prefer the more direct translation. However, "more rigorous" can also be translated as "более строгий" to emphasize the comparison. Let me check a dictionary or some examples.
For example, "a more rigorous approach" would be "более строгий подход". So in this case, "more rigorous" as an adjective modifying a noun would be "более строгий". But if it's used in a sentence like "be more rigorous", it could be "быть строже". However, since the user just provided "more rigorous" without context, the safest bet is to use the full comparative form "более строгий".
Alternatively, if the user is looking for a direct translation of the comparative form, "строже" might be appropriate. But considering common usage, "более строгий" is more likely. Let me check a few sources.
Looking up "more rigorous" in Russian, some translations use "более строгий", others might use "строже". For example, in academic contexts, "более строгий" is commonly used. So I think the correct translation here is "более строгий".
Therefore, the translation of "more rigorous" into Russian is "более строгий".
более строгий