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。
The zygote has a fixed complement of genetic information in its nucleus.
固体具有刚性、一定的形状和机械强度。
The zygote has a fixed complement of genetic information in its nucleus.
固体具有刚性、一定的形状和机械强度。
应用推荐