英文单词中有好多缩写，为什么有些单词缩写后加一英文句点，有的则不加呢，有什么规则吗？ 为什么有些英文单词缩写后要加斜杠？
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duplicatedu.pli.cate
AHD:[d›“pl¹-k¹t, dy›“-]
D.J.[6du8plikit, 6dju8-]
K.K.[6dupl!k!t, 6dju-]
adj.Abbr. dup.（形容词）缩写 dup.
Identically copied from an original.
复制的
Existing or growing in two corresponding parts; double.
存在两个相对应部分的；二倍的
Games Denoting a manner of play in cards in which partnerships or teams play the same deals and compare scores at the end:
【游戏】 复局的，复式的：牌戏中一种打法，其中搭档或牌队轮打同一手牌，最后比较得分：
duplicate bridge.
复局桥牌
n.Abbr. dup.（名词）缩写 dup.
An identical copy; a facsimile.
复制品；复印件
One that corresponds exactly to another, especially an original.
复制品：完全一样的东西，尤指与原品完全一样的东西
Games A card game in which partnerships or teams play the same deals and compare scores at the end.
【游戏】 复局
v.（动词）
du.pli.cat.ed， du.pli.cat.ing， du.pli.cates[-k³t”]
v.tr.（及物动词）
To make an exact copy of.
一种牌戏：搭档或牌队轮打同一手牌，最后比较得分的牌戏
To make twofold; double.
使重复；复制
To make or perform again; repeat:
重做，重演；重复：
a hard feat to duplicate.
难以再现的丰功伟绩
v.intr.（不及物动词）
To become duplicate.
成双
绛旓細K.K.[6dupl!k!t, 6dju-]adj.Abbr. dup.锛堝舰瀹硅瘝锛缂╁啓 dup.Identically copied from an original.澶嶅埗鐨 Existing or growing in two corresponding parts; double.瀛樺湪涓や釜鐩稿搴旈儴鍒嗙殑锛涗簩鍊嶇殑 Games Denoting a manner of play in cards in which partnerships or teams play the same deals...
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