twin
n. / adj.美 /twɪn/英 /twɪn/
双胞胎之一；成对的
one of two children born at the same time; matching or identical
例句
Lily and Lucy are twin sisters—they even wear the same clothes.
莉莉和露西是双胞胎姐妹，连衣服都穿一样的。
He keeps a twin set of keys in his backpack.
他在背包里备了一副备用钥匙。
怎么记
twin=twi（two）+n→两个一模一样的人
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