从保盛丰退位后，彭日成交还了第六辆车，这是一辆租来的宾利(Bentley)。

Mr. Pang turned in a sixth vehicle, a leased Bentley, after stepping down from PEMGroup.

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在蒲丰投针问题的基础上，把投掷物由一维的针推广到二维的凸曲线，三维的正四面体、正六面体；

This paper tries to generalize the throwing objects from the one dimension pin to the convex curve in two dimension, and even the three dimensional regular tetrahedron and regular hexahedron .

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