1. With technological changes many traditional skills have become obsolete. 随着技术的革新，许多传统技艺已被淘汰。
2. The coal-fired steam engine was taking over, and the waterwheel was fast becoming obsolete. 烧煤的蒸汽机开始占领市场，于是水车很快就过时了。
3. The introduction of gunpowder gradually made the bow and arrow obsolete, particularly in Western Europe 火药的使用使弓箭逐渐被淘汰，特别是在西欧。
4. Strategies based on such parameters may eventually be rendered obsolete by the very factors that first created an advantage. 以这种参数为基础的战略可能最终会因最初创造优势的因素而过时。
5. So much equipment becomes obsolete almost as soon as it's made. 很多设备几乎刚制造出来就过时了。
