...The duty ofevery state to protect those birds is not a debatable proposition... 
William T. Hornaday 「Our Vanishing Wild Life」
...But I am trenching upon debatable ground, and have no desire to enteran argument upon the subject...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
... planet Mars is the debatable ground between two opinions...
E. Walter Maunder 「Are the Planets Inhabited?」
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flip blat modification
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