Adopting paraboloid model of tip surface, presented the dynamics equation of negative ion flight in tip field and solve it with numerical method.

采用针尖的旋抛物面模型，给出了表面生成的负离子在针尖场中飞行的动力学方程，并用数值方法求解。

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The switch works by passing a pulse of current between the tip and the surface.

电源开关的工作原理是让电流脉冲穿过触点和触面之间。

《柯林斯英汉双解大词典》

Atomic force microscopy generates very high-resolution images (about 5-nanometer resolution) by “feeling” the surface of a sample with a tiny probe tip.

原子力显微镜是运用一种微小的探针去“感受”样本表面，能得到高分辨率的影像（约5纳米的分辨率）。

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As the tip continued its movement across the surface, the antibody was snapped off the antigen and dragged along until it hit another receptive site.

ECONOMIST: Microscopy