Choi Chi-yin has worked on construction sites in Hong Kong for more than four decades. While the 65-year-old could comfortably retire, he feels compelled to keep plying his trade as a fire safety specialist.
蔡志賢（音譯）已經(jīng)在香港建筑工地上工作了40多年。盡管這位65歲的老人可以很安逸地退休，但他覺得有必要繼續(xù)從事自己作為消防安全專家的工作。
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