double split-ring resonator pairs 双环开口谐振环对
Split and join nodes come in pairs.
分离节点和连接节点是成对出现的。
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How to split a string into key-value pairs?
如何将字符串拆分为键值对？
But the pairs are not merely split down the middle as if they were socks.
FORBES: Magazine Article
The branches split off at directly opposing points and the stems bear between nine and 13 leaves in symmetrical pairs with a lone one at the tip.
BBC: The heartbreak of watching the slow death of ash trees
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