Abnormally large progeny have resulted in animal cloning done to date, which suggests that there are serious risks to the health of the mother and any potential embryo.

还有一点需要指出的是，目前对动物进行的克隆已产生形体异常硕大的后代。这意味着母亲和任何潜在的胚胎的健康都将面临严重的威胁。

youdao

Dolly the sheep -- the first cloned animal -- was created over 10 years ago, and the only previous claim of human embryo cloning by South Korean scientist Woo Suk Hwang in 2004, was discredited.

CNN: You, again: Are we getting closer to cloning humans?