effort: 努力, put a lot of effort into, make a great effort, 努力, improve, 改善 | 龍騰Book1 Lesson9 | 均一教育平台

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effort: 努力, put a lot of effort into, make a great effort, 努力, improve, 改善

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effort: 努力, put a lot of effort into, make a great effort, 努力, improve, 改善