多年之后，他回忆说：“起初我觉得，自己正身着制服，在无聊的地铁里上下浮动着消磨人生。
Years later, he said: "I began to feel, I'm riding up and down in the subway in a uniform."
而与股票价格不同，债券价格会随着时间回归原点，这意味着债券价格会围绕历史定平均价格上下浮动。
Unlike equity prices, bond yields mean revert over time, meaning they rise and fall around their historical average. This suggests the price of German and American debt is due to fall someday.
极光发生的地区沉淀着高能粒子，高层大气流和电离层，和上下浮动的磁场。
In the auroral region we have precipitation of energetic particles, currents in the upper atmosphere and ionosphere, and fluctuating magnetic fields.
极光发生的地区沉淀着高能粒子，高层大气流和电离层，和上下浮动的磁场。
In the auroral region we have precipitation of energetic particles, currents in the upper atmosphere and ionosphere, and fluctuating magnetic fields.
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