以下为句子列表：
英文: In the UK, the number of triplet births plummeted from 2001 after the HFEA imposed a limit of two embryos for most women, but the twin birth rate has remained high, which is why the expert group is calling for further action.
中文: 在英国，自从2001年HFEA限制多数妇女只能一次移植2个胚胎以后，三胞胎出生人数直线下降，但双胞胎的出生率仍高居不下，这便是专家组呼吁采取进一步行动的原因了。
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