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A person who monitors trends or public opinion with respect to a particular field or issue.
1920s; earliest use found in Sheboygan (Wisconsin) Press-Telegram.
雅致网英汉双解词典包含236457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。