科學上線（六下）：簡單機械手作(2)：古羅馬投石器
Synopsis
投石器是遠古時代與中古時代出現的攻城武器，可把石彈、巨石或爆裂物投到敵方的城牆、城內或者兵陣內而造成破壞，我們會同 ...
![[ 科學與科技 ] 如何變成大力士：簡單機械輪軸](https://i.ytimg.com/vi/fPDZVhgJ1_s/hq720.jpg?sqp=-oaymwEcCNAFEJQDSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLAOx9f4KPfuWWBC46C7NCzZaeSTPQ)
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