更值得关注的是技术迭代风险。机器人更新换代速度较快，新款产品一旦性能更好、价格更低，旧设备的租赁吸引力会迅速下降。设备折旧不仅来自物理损耗，更来自技术代差。
At its core, a stream is just a sequence of data that arrives over time. You don't have all of it at once. You process it incrementally as it becomes available.，这一点在heLLoword翻译官方下载中也有详细论述
How to reproduce。业内人士推荐服务器推荐作为进阶阅读
Visitors to the Victoria & Albert Museum (V&A) will be able to "step back in time" as a reconstruction of the original YouTube watchpage goes on display.
帕特尔指出，“美国目前国内钪产量为零，也没有在中国以外已经投产运转的替代来源”，现有库存恐怕以“月”为单位计算，而非“年”。