blackface

1.A case might be made for the blackface minstrel show, vaudeville, or for the entertainments of some medicine shows, camivals, and riverboats as American folk drama.

滑稽说唱团演出(由白扮演黑)、杂耍演出，或一些娱乐性药品巡回演出、表演会与艺船等，均可作为美国民间戏剧例证。

2.While this is occurring an unfertilized egg cell is taken from a Blackface ewe with its DNA filled nucleus taken out leaving a nucleus free egg cell that will later produce an embryo (3).

（接着如果把它）放在一个细胞核已去除黑面母羊营养细胞中，它一会儿就会产生一个胚芽。