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免费在线货币重量计算器，精确计算美元纸币和硬币重量。支持金额转重量、重量转金额双向查询，提供专业的个人财务计算工具和API服务，满足银行、金融等行业需求。
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基于剑桥大学数据的免费英语学习时间计算器，精准评估达到A1-C2各级别所需学习时间。支持个性化学习计划制定和进度跟踪，助您高效规划英语学习路径。
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