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1That cannot be flustered or alarmed (rare).
2Designed to prevent rattling.
Early 20th century; earliest use found in Syracuse (New York) Post-Standard.
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。