The electrons, much smaller than the nucleus, don't fly around at random but stick to fixed orbits.

电子比原子核小得多，并不任意乱飞，而是贴着固定的轨道飞行。

youdao

The electrons, much smaller than the nucleus, don't fly around at random but stick to fixed orbits.

电子比原子核小得多，并不任意乱飞，而是贴着固定的轨道飞行。

youdao