There are fewer than 100 documented cases of "identical triplets plus one" in the United States, hospital officials said.
医院有关人士表示,在美国只有不到100个“三胞胎加一”的案例。
There are fewer than 100 documented cases of "identical triplets plus one" in the United States, hospital officials said.
医院有关人士表示,在美国只有不到100个“三胞胎加一”的案例。
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