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The visitor can ponder over the boomerangs used by aborigines at the time of Cook.
来访者可以琢磨琢磨土著人在库克时期用的回飞镖.
《简明英汉词典》
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But Obama still runs a risk: that his overworked rhetoric loses its power and boomerangs on him.
但是奥巴马任然冒了风险，那是他强有力的言辞在他身上失去了它的力量和（自食其果）。
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