Additional product is the product of the fourth level, namely the product contains additional services and benefits.
附加产品是产品的第四个层次，即产品包含附加的服务和效益。
Compared with three-level atomic system, the atomic coherence effects in four-level can lead to EIT and EIA, which depend on the intensity of control light and the relaxation of the fourth level.
与三能级原子系统相比，四能级原子相干效应即可导致电磁感应透明的产生，也可产生电磁感应吸收现象，取决于控制光的强度和第四个能级衰变率的大小。
The fourth level is analysis---- breaking down complex information into simpler parts.
第四个层次是分析，将复杂的知识分解为简单的各部分。
The fourth level is analysis---- breaking down complex information into simpler parts.
第四个层次是分析，将复杂的知识分解为简单的各部分。
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