...There was a slight undulation in the ground, however, which enabled him to advance about fifty yards further, by means of lying down quite flat and working himself forward like a serpent...
R.M. Ballantyne 「The Dog Crusoe and his Master」
...At fifteen miles from camp we sighted fromthe top of an undulation in the scrub, a pointed hill a little south ofwest, also another higher and longer, and lying more southerly...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
...The country wasentirely open, and only a sandy undulation to the eastward bounded thehorizon...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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