How do you say this in Japanese? 日本語

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Formal Japanese:
```
日本語
```

Casual Japanese:
```
日本語
```

In Japanese, the formality of speech is often determined by the choice of vocabulary, verb forms, and sentence endings. In the given text, there are no specific expressions that indicate formality or casualness, so the translations remain the same in both formal and casual contexts. However, in more complex sentences or conversations, the formality can be distinguished by the use of honorific language, polite verb forms, and respectful sentence endings in formal speech, while casual speech may include plain verb forms and informal sentence endings.