Chapter 21: The Eye of the Snake

Simplified Chinese (Mandarin: China)
蛇眼 Shé-yǎn	蛇 shé = 'snake'. 眼 yǎn = 'eye'.	Snake Eye
Traditional Chinese (Mandarin: Taiwan)
以蛇之眼 Yǐ shé zhī yǎn	以 yǐ = 'by means of' (instrumental). 蛇 shé = 'snake'. 之 zhī = connecting particle (classical). 眼 yǎn = 'eye'.	Through the Eye of the Snake
Japanese
蛇の目 Hebi no me	蛇 hebi = 'snake'. の no = connecting particle 目 me = 'eye'.	The Eye of the Snake
Korean
뱀의 눈 Baem-ui nun	Pending
Vietnamese (Chinese characters show etymology)
Mắt rắn	mắt = 'eye'. rắn = 'snake'.	The Eye of the Snake
Mongolian (new)
Могойн нүд Mogoin nüd	Pending

This is the eye of the snake Nagini through which Harry viewed certain terrifying events in a dream.

How is 'eye of the snake' translated?

The Chinese translator from Mainland China, creates a single compound word meaning 'snake-eye' 蛇眼 shé-yǎn, i.e., 蛇 shé + 眼 yǎn. The ordinary everyday term for 'eye' in the Chinese colloquial is 眼睛 yǎnjing. In forming compounds, only the more succinct Classical form 眼 yǎn is used.
The Chinese translation from Taiwan features an alternative method of describing the eye of a snake: it adds the Classical possessive particle 之 zhī between 蛇 shé and 眼 yǎn. Again, the translator has chosen to use the more elegant Classical form 眼 yǎn 'eye' in preference to the colloquial 眼睛 yǎnjing. The Taiwanese version adds the Classical-style particle 以 yǐ = 'by means of' (instrumental) to indicate that it was through the eyes of a snake that Harry saw.
The Vietnamese mắt rắn is a brief compound form similar to the Chinese. It does not use the particle của to indicate possession.
The Japanese translation uses 蛇の目 hebi no me, where 蛇 hebi 'snake' and 目 me are connected by the possessive の no. The meaning is thus 'snake's eye'.

Janome

Note that 蛇の目 can also be read ja-no-me, the name for a traditional circular decorative pattern, often associated with the traditional janome umbrella.

(Detailed notes on the chapter can be found at Harry Potter Lexicon)