６４４年

• Traditional Chinese Character(HanT): ６４４年
• Simplified Chinese Character(HanS): ６４４年
• Bopomofo(Mandarin Phonetic Symbols): ㄌㄧㄡˋ ㄙˋ ㄙˋ ㄋㄧㄢˊ (ㄌㄙㄙㄋ)
• Bopomofo(Zhuyin Keyboard Input/IME): xu.4n4n4su06
• (ASCII) Hanyu Pinyin: "liusisinian" "Liu4Si4Si4Nian2" "Liu4 Si4 Si4 Nian2" (LSSN)
• (Latin) Hànyǔ Pīnyīn: LiùSìSì [ Liù Sì Sì ]
• (英文翻譯) English Translation: "644 years"
• (西語翻譯) Traducción Español: "644 años"
• (日文翻譯) 日本語翻訳: "644年"