When the microscope's sharp tip applied a positive voltage to the material's surface, it drew conducting lines that exist in the space between the oxide layers.

当显微镜的尖端把正电压施加到材料表面时，它就在氧化层之间的空白处画出了导线。

youdao

One was coming at me with a huge spear, with its sharp tip pointed at my heart!

VOA: special.2010.07.10

You can use electrocautery, a hook, a pair of scissors, a sharp-tip dissector, a blunt-tip dissector, a right-angle dissector, or a suction device.

NEWYORKER: Personal Best

McGregor needed to make a fine flying save to tip away a sharp shot on the turn from Brazilian-born forward Cacau.

BBC: Rangers 0-2 Stuttgart

When lightning strikes a plane, the bolt typically hits a sharp part of it, such as a wing tip.

CNN: Could lightning have brought down Air France plane?