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Hi Harumi, maybe the watch has a little battery that stores solar power? Otherwise this really doesn't make sense! :)
Can I help?
how may yo be able to know= Simpler: How can you know what time it is...
where you are not able to have some sun..= Simpler: ..where there is no sun
a good time investigating how does it works.= ..a good time investigating how it works.
See you!
Pieter

I found a solar watch that you can buy, I think thats weird, how may yo be able to know the time if you are inside a house or somewhere in where you are not able to have some sun... I believe that's a ridiculous item, but if I had to boy it and give it to someone I'll give it to my nephew, I'm sure he would have a good time investigating how does it works.