| 词组 | porcupine head |
| 释义 | porcupine head noun in hot rodding and motor racing, the cylinder head on the big-block engines manufactured by Chevrolet US, 1993 John Edwards, Auto Dictionary, 1993, gives a neat etymology: ‘When the valve covers are removed, the valve stems appear to stick out at odd angles, like the needles on a porcupine’. |
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