他的表兄弟泰德和凯特必须根据伦敦周遭的线索，在为时已晚之前找到他。
His cousins, Ted and Kate, have to follow clues (线索) around London and find him before it is too late.
他没用多长时间就到了那块岩石，就根据他兄弟告诉他的树和其他记号找到了那个地方。
He was not long before he reached the rock, and found out the place, by the tree and other marks which his brother had given him.
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