...He was as shy of all debatable subjects as a fox is of a trap... 
John Burroughs 「Birds and Bees, Sharp Eyes and, Other Papers」
... 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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