2. historical reasons (Historical causes) That is due partly to the development of science and humanity. Example of objects. The pen is obvious, for example, that the original name remains, but there is a change to the format, whether it is a pen. Electric fountain pen Changes to these objects, the original meaning of the word that pens, change. To social institutions, it is one of the reasons that caused the change in meaning is derived from the word King. The former refers to a leader who is a warrior, but enough has changed the rule of the King was changed. According to the regime the idea. Advances in modern but become outdated ideas. To date, such as in the medical industry. If the physician, told a doctor he did not have the skin affliction? know?
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