界: 名词1.(相交的地方; 划分的界限) boundary 短语和例子国界 the boundary of a country; national boundary; 山西和陕西以黄河为界。 the boundary between shanxi and shaanxi is the huanghe river.2.(一定的范围) scope; extent 短语和例子外界 e
Example Sentences:
1.
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。
