wing nut
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【机】 翼形螺帽英语解释：
名词 wing nut:
- any tree of the genus Pterocarya; fruit is a small winged nutlet; Caucasus to southeastern Asia同义词：wing-nut
- a threaded nut with winglike projections for thumb and forefinger leverage in turning同义词：wing-nut, wing screw, butterfly nut, thumbnut
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