predict,sign,indicate,inform用法有什麼区别

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predict,sign,indicate,inform用法有什麼区别
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predict---To foretell something;predict an eclipse;预报日(月)蚀;predict rain for tomorrow预告明天有雨(常与that连用)预言;预测;预示She predicted that he would marry a doctor.她预言他将娶一位医生....