当他们到达那里，他们发现被前面的一条河拦住了。
When they got there, they found they were stopped by a river in front of it.
当他们到达那里，他们通常有同年龄的其他学生玩伴，享受他们的自由。
When they get there they usually enjoy the company of other students and take advantage of their freedom and anonymity.
一天他们决定去野餐，当他们到达那里的时候，他们发现他们忘记带苏打了。
One day they decided to go on a picnic. When they got there, they realized they had forgotten the soda.
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