To make an atomic bomb we have to use uranium 235,in which all the atoms are available for fission.
To make an atomic bomb we have to use uranium 235,in which all the atoms are available for fission.
制造原子弹，我们必须用铀235，因为轴的所有原子都会裂变。
To make an atomic bomb we have to use uranium 235,in which all the atoms are available for fission.
制造原子弹，我们必须用铀235，因为轴的所有原子都会裂变。