Many balls and cylinders that roll are ideal – as long as there are no small or moving parts and the size is appropriate.
许多球和圆棒都是很理想的玩具——随着时间流逝，那些玩具上面没有可以活动的小部件，并且它们的大小也合适。
Ballista: Ancient missile launcher designed to hurl long arrows or heavy Balls.
投石机：古代投掷物体之发射器，用作发射长箭或重型球状物。
Ballista: Ancient missile launcher designed to hurl long arrows or heavy Balls.
投石机：古代投掷物体之发射器，用作发射长箭或重型球状物。
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