atom at a cube corner

例句：

1. 1. The atom is thebasic unit of matter.
   原子是物质的基本单位。
2. 2. The atom is made up ofprotons and neutrons.
   原子由质子和中子组成。
3. 3.The atom has a very small sizecompared to other particles.
   原子与其他粒子相比非常小。