对于这个问题，过去的指导作用并不像我们认为的那样可靠，因为过去的技术变迁速度较慢，这意味着工作岗位的取代能跟得上工作岗位的变换。
Here, the past may be a less reliable guide than we think, because the slower pace of technological change meant that job replacement kept up with job displacement.