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3. 据估计世界上已有两百万人体验过蹦极跳了。
that two million people around the world have now tried bungee jumping.
3. It is estimated
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3. 据估计世界上已有两百万人体验过蹦极跳了。
that two million people around the world have now tried bungee jumping.
3. It is estimated