屋面接近垂直的一种折线形屋顶。

A mansard roof with sides that are nearly perpendicular.

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对于平衡平台来说，最重要的测量角度是接近垂直时的。

For a balancing platform, the most important angles to measure are near vertical.

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当此抛物线运行到接近垂直状态时，它就到达了趋势结束的最后期限。

When the parabolic curve moves towards vertical it sets the maximum date for the end of the trend.

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