The marble is a solid sphere, so its mass is distributed closer to its center.
达尔是一个实心球，所以它的质量是分布的 靠近其中心。
Solid sphere
原声例句
Crash Course Physics 速成课物理
精选英语短文
Early research assumed that hailstones fell like solid ice spheres and showed very high fall speeds, even for very small hailstones.
早期研究假设冰雹像固体冰球一样下落， 并且显示出非常高的下落速度， 即使对于非常小的冰雹也是如此。
精选英语短文
However, recent research outside of NSSL using 3-D printed casts of real hailstones suspended in a vertical wind tunnel has repeatedly shown that natural hailstones fall more slowly than solid ice spheres.
然而， 最近在 NSSL 之外的研究使用 3D 打印的真实冰雹模型悬浮在垂直风洞中， 一再表明天然冰雹比固体冰球下落更慢。
中文百科
球 (数学) Ball (mathematics)
（重定向自Solid sphere）
![在欧氏空间里，球是指球面的内部。](/Images/godic/202502/12/Sphere_wireframe.svg2446.png")
在数学里，球是指球面内部的空间。球可以是封闭的（包含球面的边界点，称为闭球），也可以是开放的（不包含边界点，称为开球）。
球的概念不只存在于三维欧氏空间里，亦存在于较低或较高维度，以及一般度量空间里。n 维空间里的球称为 n 维球，且包含于 n-1 维球面内。因此，在欧氏平面里，球为一圆盘，包含在圆内。在三维空间里，球则是指在二维球面边界内的空间。
英语百科
Ball (mathematics) 球 (数学)
（重定向自Solid sphere）
![Trois exemples de boules de rayon 1 dans
R
2
\displaystyle \mathbb R ^2
pour différentes normes.](/Images/godic/202502/12/Vector_norms.svg2446.png")
In mathematics, a ball is the space bounded by a sphere. It may be a closed ball (including the boundary points that comprise the sphere) or an open ball (excluding them).
These concepts are defined not only in three-dimensional Euclidean space but also for lower and higher dimensions, and for metric spaces in general. A ball or hyperball in n dimensions is called an n-ball and is bounded by an (n−1)-sphere. Thus, for example, a ball in the Euclidean plane is the same thing as a disk, the area bounded by a circle. In Euclidean 3-space, a ball is taken to be the volume bounded by a 2-dimensional spherical shell.
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