[br][b]参考答案:[/b][br]在主城中建设训练场（Training grounds）即可升级，农民-->弓箭手-->步兵-->牧师-->骑士,就是升级费用太高，不太合算 上一篇 《兔子一天可以吃多少萝卜》
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There are lot of training grounds still available for anyone, who is a novice and wants to increase his skills.
有许多练习的场地供那些想提高技巧的新手使用。
Similar trends have been evident at the other top training grounds that have long fed the upper ranks of Wall Street.
长期以来为华尔街提供高层人才的其他顶尖训练场，也明显出现类似趋势。
This adapted physiology combined with Kenya's ideal high-altitude training grounds is part of what allows them to consistently break long distance records.
生理上的这一适应加上肯尼亚理想的高海拔训练场地，是他们屡屡打破长跑记录的部分原因。
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