他所做的是：经过一段混合班的试运行期后，他改变了学校的政策。
What he did was: After an initial trail period of mixed classes, he changed the school policy.
卡斯特罗兄弟也是，在他们的人生的最后一段时光里，准备领导古巴走向混合经济，像中国那样？
So are the Castro brothers, in the twilight of their lives, preparing to lead Cuba towards a mixed economy, similar to that of China?
经过一段时间，形成一种混合物，它包含实验室毒株的内部成分以及大流行毒株的外部成分。
After a while, a hybrid is formed which contains the inner components of the laboratory strain, and the outer components of the pandemic strain.
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