a person or thing that precedes the coming or development of someone or something else
前驱,先驱,先导
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the ice safe was a forerunner of today's refrigerator.
冰柜是现代电冰箱的先导。
a sign or warning of something to come
前兆,预兆,征兆
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overcast mornings are the sure forerunners of steady rain. 阴暗的早晨预示着肯定会有连绵阴雨。
〈古〉 先遣报信者。