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係JIGOCITY搵到個水力發電既跳字鐘 雖然唔太明個原理係點, 但好得意 HAHA
夏天就到, 大家減少開冷氣, 用風力發電風扇啦~ 平日就用太陽能燈泡啦~ XD
上面果位好廢lor lol 想環保, 平日用慳電膽, 用完電腦熄機都已經好好