单词 | parasitic twin |
释义 | parasitic twinnoun The smaller and less completely developed member of a pair of unequal conjoined twins, often consisting of an amorphous mass of tissue attached to or within the larger twin.Fully developed twins born conjoined at the head are extremely rare, accounting for one of every 2.5 million births, but parasitic twins, where one twin stops developing in the womb, are even rarer....
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