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lit. the duck is the first to know if the spring water is warm (idiom)
fig. an expert in the field knows which way the wind blows
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。