At low temperatures, the difference in population of atoms between two energy levels, which is the basis of maser action, is greater . 在低温下，作为微波激射作用基础的两个能级之间原子数的差别较大。
The energy of activation is the minimum energy level that two colliding molecules must possess in order to undergo a given chemical reaction . 激活能就是使两个碰撞分子得以进行某特定的化学反应所必须具有的最低能级。
The absorption of this radiation in various lines followed by cascade transitions to lower levels might ultimately produce an anomalously high population for the excited levels of these molecules . 在各谱线处对这种辐射的吸收以及接着向低能级的级联跃迁最终可能使这些分子的激发能级产生异常高的粒子数。
Lifting the economical capacity lend of yangtze delta area 提升长江三角洲的经济能级
Urban function level and modern service industry 论城市能级水平与现代服务业
The energy level figure express the types iconically 用能级图形象的反映相应的情况。
Study of structures and energy levels of pdyn n 团簇结构和能级分布的研究
Atomic coherence effects in four - level system 四能级系统中的原子相干效应
Two - level atom in a standing electromagnetic wave 驻波光场中的二能级原子
Defect energy level of 1 1 stress - layer semiconductor material 1应力半导体材料缺陷能级
