將繩索纏在開關上,下面綁上重物,上面以支點固定,中間再綁蠟燭
時間一到,繩子就會被蠟燭燒斷,重物落地就可以帶動開關了
http://i.imgur.com/IVOGjzg.jpg

大家都會做嗎!?
我是那個不會的人欸,怎麼辦QmQ
難道我很笨嗎?
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