[請益] TPO 18 Lightning
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1. A storm cloud first develops a positively charged layer at the top then a
negatively charged middle layer and finally, a positively charged layer at the
bottom
2. Lightning from cloud to ground follows a channel that forms when a stream
of positive particles coming up from the ground
3. Lightning from a cloud to the ground is more likely to be destructive than
is lightning that takes place within a cloud
4. A separation of oppositely charged particles in clouds develops from
collisions of falling ice pellets with ice crystals, from updrafts and from
temperature variations
5. Field studies laboratory simulations and high-speed photography have all
been used to investigate the way charge separations develop in clouds
6. Once a channel has been formed it is usually used by several successive
electrical discharges that illuminate the channel as flashes of lightning.
想請問為什麼4.不對？
感覺上4.把第二段做了很好的摘要阿....
謝謝大家幫忙！
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