相反，海克曼将注意力指向在过去40年中不断恶化的家庭环境。
Instead, Heckman directs attention at family environments, which have deteriorated over the past 40 years.
这个补丁通过把已缓存的引用从一个序列号转换为指向队列中最高的包（过去已经选择性应答）的指针从而对此情况加以优化。
The patch optimizes this case by converting the cached reference from a sequence number to a pointer to the highest packet in the queue that has been SACKed in the past.
爱因斯坦的理论并没有一个特别的从过去指向未来的时间方向。
Einstein's theory does not have a preferred direction for time, from the past to the future.
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