单词：optical functions
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beacon, ['bi:kən] n 灯塔（位于海岸，用以导航）；烽火（警告敌人的接近） 【例】Fires beaconed the darkness 火光驱散了黑暗。 【记】bea＝bead珠子，夜明珠，con＝can能。夜明珠能在晚上导航。 烽火
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