The third was a register of all pregnancies of twins, triplets or other multiple births.
第三组对所有双胞胎，三胞胎等多胞胎的妊娠情况进行了登记。
The risks of multiple births are much higher for both mother and babies.
多胞胎对母亲和婴儿来讲风险都很高。
The most common multiple births are twins, two babies born at the same time.
最常见的多胎是双胞胎，两个婴儿同时出生。
The most common multiple births are twins, two babies born at the same time.
最常见的多胎是双胞胎，两个婴儿同时出生。
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