...The duty ofevery state to protect those birds is not a debatable proposition... 
William T. Hornaday 「Our Vanishing Wild Life」
...As a businessproposition it is to-day no more a debatable question, or open toargument, than is the water supply or sewer system of a city...
William T. Hornaday 「Our Vanishing Wild Life」
... planet Mars is the debatable ground between two opinions...
E. Walter Maunder 「Are the Planets Inhabited?」
...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」
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darkling sympathises coop
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