Obsolete
What you think it means: Old, out of date。你以为单词的含义是：旧的，过时的。What it really means: Not produced, used, or needed。单词的真正含义是：未生产的，未使用的，不需要的。
You'll see this one in the tech industry a lot. People in tech article comments will comment that a phone is obsolete when they really mean that it's out of date. The literal definition of obsolete is an item that it isn't produced, needed, or used anymore. An example of this is is the steam engine. It's largely inefficient compared to today's combustion engine and even more inefficient than the emerging electric engines. Thus, steam engines are not used, produced, or needed anymore. Yes, they are also old and out of date, but obsolete is kind of the next step after old and out of date。这个单词在科技行业经常出现。在科技文章评论中，人们会说某个电话机obsolete(未使用的)，其实他们是想说电话机过时了。Obsolete的字面定义是指某物未被生产、不被需要或不再使用。一个例子就是蒸汽机。跟如今的内燃机相比，蒸汽机相当不给力，甚至都比不上新兴的电发动机;因此，蒸汽机是不被使用的、不被生产的或不再被需要的。没错，蒸汽机也是旧的、过时的，但obsolete是“旧”与“过时”更后一步的阶段了。
