The Hamiltonian of the system is the Driac operator which as a matrix differential operator is not semibounded from below. 系统的哈密顿函数是作为矩阵微分算子的狄拉克算子，它不是半有界的。
The molecular Hamiltonian is formidable enough to strike terror into the heart of any quantum chemist. 分子的哈密顿函数麻烦得足以使任何一个量子化学家心惊胆战。
