HD
木工, 绝缘子, Social Security (United States), 社会保障法, 社会保险, 增值税, 变电站, 美国国会, 产业化项目, 涡轮(能源生产), 房屋建筑, 行政, 国会大厦(华盛顿), 林业, 拖车(车辆部分), 议会大厦, 工程起重机, 建筑工人, 烟囱(架构), 公共建筑, 自动化, 后勤, 华盛顿(市), 发电厂, 进度(里程碑), 建筑工地, 干, 抽烟, 运输, 行业, 首都, 历史镜头, 人(人类), 天,

视频 1

HD
木工, 绝缘子, Social Security (United States), 社会保障法, 社会保险, 增值税, 变电站, 美国国会, 产业化项目, 涡轮(能源生产), 房屋建筑, 行政, 国会大厦(华盛顿), 林业, 拖车(车辆部分), 议会大厦, 工程起重机, 建筑工人, 烟囱(架构), 公共建筑, 自动化, 后勤, 华盛顿(市), 发电厂, 进度(里程碑), 建筑工地, 干, 抽烟, 运输, 行业, 首都, 历史镜头, 人(人类), 天,

视频 2
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