他们交换了座位。
因为同一座次的旅客同时登记，他们不会被迫穿过别的旅客交换座位。
Because passengers in the same seat types board together, they do not have to step over each other to swap seats.
熊爸爸太重了。熊宝宝太轻了。他们交换了座位。刚刚好！ ！
Papa Bear is too heavy. Small Bear is too light. They exchange seats. Just right!
熊爸爸太重了。熊宝宝太轻了。他们交换了座位。刚刚好！
Papa Bear is too heavy. Small Bear is too light. They exchange seats. Just right!
熊爸爸太重了。熊宝宝太轻了。他们交换了座位。刚刚好！
Papa Bear is too heavy. Small Bear is too light. They exchange seats. Just right!
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