translation.en: We've identified the 50 most important machines that we think it takes for modern life to exist -- things from tractors, bread ovens, circuit makers.
translation.zh: 我们认定了50个最重要的机器 我们觉得它们是现代生活的得以存在的关键-- 从拖拉机， 面包烤炉，电子线路的制造。