polarized plug
North American
noun
A two-bladed plug with one blade larger than the other, so that it can only be inserted into the socket one way round.
Origin
1930s; earliest use found in Decatur (Illinois) Herald.
| 单词 | polarized plug |
| 释义 | polarized plugNorth American noun A two-bladed plug with one blade larger than the other, so that it can only be inserted into the socket one way round. Origin |
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