But obtaining embryonic stem cells means destroying blastocysts, and an American law passed in 1996 forbids the use of federal-government money for research that requires such destruction.

• 但是若要获得胚胎干细胞必须破坏胚泡，所以美国在1996年颁布的一项法律，禁止联邦政府对这类需要破坏胚泡的实验给予资金支持。