内容简介：
"I tell you, Elephant, it's the Bird boys, and nobody else!""But they had a monoplane last summer, Larry; and you can see for yourself it's a biplane out yonder over the lake. So that's why I thought it must be Percy Carberry and his crony, Sandy Hollingshead.""Shucks! stir up your think-box, Elephant. Get a move on your mind, and look back. Don't you remember Percy lost his old biplane when he took that trip down to South America, and had some trouble with the revolutionists in Colombia?""Say, now, that's right. You mean the time Andy Bird found his long-lost father, whose balloon left him a prisoner in such a queer way? Yes, but tell me, where would Frank and Andy Bird get a biplane now?""Oh! rats, what ails you, Elephant? Didn't they make the other; and don't you know they've been busy all winter, in that shop Old Colonel Whympers fitted up for them out in the field? And not even such bully good friends as you and me were allowed to take a peep inside. That's what they were working on—building this new biplane, after sending for the parts."
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