With the differential geometry and engagement theories, induced curvature formulas of point engagement were deduced, and the formula of the local contact areas was given.

利用微分几何和啮合原理推导出该机构的点啮合的诱导曲率方程，给出了接触域大小的计算公式。

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The new department would also give state and local agencies one point of contact for homeland security issues.

CNN: Fixing a 'confusing patchwork'

Since each was staffed with at least one Obama for America staffer, they served as an initial point of contact with the campaign, and a recruitment center for local volunteers.

CNN: Analysis: Obama won with a better ground game