This paper studies the fundamental problem of perspective projection (central projection) and gives a corresponding equation. The equation can be used in all cases of perspective projection.

对透视投影(中心投影)的基本问题进行了研究，并给出了相应方程；该方程适用于透视投影的一切情况。

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The bank's central projection for inflation shows it rising a bit further next year.

ECONOMIST: Economic troubles: When the credit dries up | The

In particular, it worries that the short-term outlook for consumer spending may prove more disappointing than its central projection.

ECONOMIST: The Bank dampens hopes of interest-rate cuts

MPC's central projection is that inflation will be close to the 2% target in two years' time (see chart).

ECONOMIST: The Bank is in no hurry to raise the price of money