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Through personal experience, I've learned that skills - based volunteerism is one of those double bottom - line investments.
从个人经验来看, 我意识到以技术为基础的志愿服务是一种“双重底线”投资.
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英汉双解词典包含4367426条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。