While active words demand constant practice and useful words must be committed to memory, words that do not often occur in everyday situations require just a nodding acquaintance.
积极词汇需要经常练习，有用的词汇必须牢记，而在日常情况下不常出现的次只需要见到时认识即可。
They talked for several minutes, Frederick smiling broadly and nodding his head vigorously every so often.
他们交谈了几分钟，弗雷德里克偶尔笑一笑并用力点头。
Nodding: it's a very polite act often used in English-speaking countries when people say hello or good-bye to each other.
点头：这是英语国家常见的礼貌动作，一般用于与别人打招呼或分手时道别。
Nodding: it's a very polite act often used in English-speaking countries when people say hello or good-bye to each other.
点头：这是英语国家常见的礼貌动作，一般用于与别人打招呼或分手时道别。
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