他花了好几年才证明了这条定理。他花了好幾年才證明了這條定理。他花了好幾年才證明了這條定理。

It took him several years to prove this theorem.

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Simplified: 他花了好几年才证明了这条定理。
Traditional (Taiwan): 他花了好幾年才證明了這條定理。
Pinyin: Tā huāle hǎojǐnián cái zhèngmíng le zhè tiáo dìnglǐ.
Bopomofo: ㄊㄚㄏㄨㄚ ˙ㄌㄜㄏㄠˇ ㄐㄧˇ ㄋㄧㄢˊ ㄘㄞˊ ㄓㄥˋ ㄇㄧㄥˊ ˙ㄌㄜㄓㄜˋ ㄊㄧㄠˊ ㄉㄧㄥˋ ㄌㄧˇ。

Written with HSK 4 vocabulary, at CEFR level B1.

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定理

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