北欧国家本质上更加不同的是：出生于底层的儿子们（最穷的五分之一）同那些生于比他们高一级的（次底层的）挣得差不多一样多。
The Nordic countries are distinctive in one further way: the sons born at the bottom (into the poorest fifth) earn roughly the same as those born a rung above them (the second-poorest fifth).
在一个时期，表层和次表层的水流方向相反；表层水流向外海方向流动，靠近底层的水流则向陆地方向流动。
For a time, surface and subsurface current are in opposite directions; flow is seaward at the surface and landward near the bottom.
在第一次设置系统时，对于磁盘的配置，可以从最底层(物理层)开始，然后是设备层、逻辑卷、文件系统、文件和应用程序。
When first setting up your systems, start from the bottom (the physical layer) as you configure your disk, the device layer, its logical volumes, file systems, and the files and application.
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