| 单词 | erf | 
| 释义 | Word Frequency erf(ɜːf) nounWord forms:  plural erven (ˈɜːvən)  South Africa a plot of land, usually urban, marked off for building purposes Word originAfrikaans Word Frequency Erf(ɜːf) noun acronym for electrorheological fluid: a man-made liquid that thickens or solidifies when an electric current passes through it and returns to a liquid when the current ceases  | 
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