Much historic controversy pivots around the figure of Soviet dictator Joseph Stalin,who butchered millions of his own citizens in a bloody campaign to consolidate power.

VOA: standard.2009.12.25

But at the same time, because there is so much controversy about it,

然而，与此同时，因为克隆引发的争议很多，

生物克隆是热点问题 - SpeakingMax英语口语达人

But at the same time, because there is so much controversy about it,

然而，与此同时，因为克隆引发的争议很多，

生物克隆是热点问题 - SpeakingMax英语口语达人