The isoline chart is the main form of expressing space distributing characteristic of geographical factor, and it has the common characteristic of being direct, accurate, scientific, readable.

等值线图是表示某一地理要素空间分布特征的主要形式，具有直观、准确、科学、可读性强等共同特征。

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When you factor in some of the other common expenses like expensive commercial office space, perhaps sky-high midtown Manhattan office space, along with expensive travel, and the costs quickly add up.

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