roothaan proposed representing the hartree fock orbitals as linear combinations of a complete set of known functions called basis function . 罗汤建议把哈特利福克轨道表示成已知函数称基函数。
object can be used across function calls and threads 可以跨函数调用和线程使用
function call is an empty node set, which the 函数调用的结果是一个空节点集,
object, or some custom object that lets the function call 对象还是一些让该函数调用
executes a late-bound method or function call 执行后期绑定方法或函数调用。