来自云层的电子流与正粒子流相遇，而这些正粒子流通常来自于高而尖的结构，如金属旗杆或塔。
The stream of positive particles that meets the surge of electrons from the cloud often arises from a tall pointed structure such as a metal flagpole or a tower.
长而尖的叶或茎(直接从地面生出的，如草或芦荀)。
Long pointed leaf or stem (eg of grass or asparagus) growing directly out of the ground.
它的嘴和舌头上都排列着小而尖的牙齿，以防止猎物逃跑。
Both its mouth and tongue are lined with small, sharp teeth, preventing the prey from making a getaway.
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