名词
中文翻译：小丘
同义词：
['mound', 'hillock', 'mound of earth']
例句：
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1. The cairn marks the spot where a lost explorer might have hidden his treasure.
这个土堆是失落的探险家可能藏匿宝藏的地方。
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2. The farmer carefully placed the cairn on top of the grave to honor the dead.
农民小心翼翼地将土堆放在坟墓上，以纪念死者。
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3. The cairn was built as a tribute to the brave soldiers who fought in the war.
这座土堆是为了纪念在战争中英勇作战的士兵而建造的。