1919年，清华大学首次规定学生必须游泳，但后来由于学生人数过多，学校也没有足够的游泳池供学生学习游泳而放弃了这一规定。
Tsinghua University first made swimming a requirement in 1919 but later gave it up because the number of students became too large and there were not enough swimming pools in the school for them to learn swimming.
所以我开始学习游泳、跳水、爬树。
我们只能通过游泳来学习游泳。
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