在舞蹈中，两名表演者共用一套舞狮服装，其中一人挥舞着狮头，另一人挥舞着狮身和狮尾。
In the dance, two performers share one lion costume with one waving the lion's head and the other waving the lion's body and tail.
然后你试试在另一人群中复制那个发现。
Then you go and try and replicate that finding in another population.
在研究大量夫妻事例中，其中一人感染HIV而另一人没有感染（随机抽取夫妇），得到了很明显的证明。
The evidence for the effectiveness of condoms is clearest in studies of couples in which one person is infected with HIV and the other not (discordant couples).
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