内陆的平地和山谷中种着茂密的椰子树。The interior flatlands and valleys are thickly planted with coconuts.椰子树原产于马来西亚。The coconut palm is a native of Malaysia.战后栽植的这些椰子树使这个城市显得更加美丽.The coconut palm trees planted after the war added to the b...
Construct an animation of the deltoid sliding on two mutually perpendicular lines.建构一动态绘图:展示三角线沿著互相垂直的两轴滚动.Construct two mutually orthogonal tangents of the deltoid. Where do they meet?三角星形线的两条互相垂直的法线的交点在哪里?Construct rot...