students had to work harder
...的女孩看上去很整洁 » That is a black hair girl looked very clean and tidy 同学们更加努力了 » Students had to work harder 知识管理将是建筑企业的管理核心 » Knowledge management will be a construction enterprise management of core ..
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students had to work harder
学生们不得不更加努力地学习
以上为机器翻译结果，长、整句建议使用 人工翻译 。