资讯
So, I know if I let drop this apple,it will fall because of gravity. Yes.Ooh ... This short film is suitable for teaching science at KS2 in England, Wales and Northern Ireland and 2nd Level ...
ANDY TORBET:'As they rotate, the force of gravity pulling the bird down 'is ... They could make posters and simple miniature prototypes, before presenting their designs to the rest of the class ...
一些您可能无法访问的结果已被隐去。
显示无法访问的结果