When you go down the highway and you look up and see those sodium vapor lamps, the sodium vapor exists as the dimer Na2.
你在下高速公路时,会看到一些钠蒸汽灯,蒸汽灯中钠就有以Na2存在的。
It is the coastal plain, and that provides, or that is the main highway out of Egypt or down to Egypt.
这就是海岸平原,它提供了或说它本身就是,离开埃及或者下埃及的主要通道。
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