In typical double-clad fiber lasers with a reasonable length, the loss coefficient of pump light is usually larger than the gain provided by the re-emission arising from the interaction between the pump photons and upper-level ions.
对于典型的足够长双包层光纤激光器，抽运光损耗系数通常是远大于再发射项所产生的增益，因而，忽略上能级粒子数是合理的。
参考来源 - 端面抽运准二能级双包层光纤激光器的理论探讨·2,447,543篇论文数据，部分数据来源于NoteExpress
The data operation on POS is to transfer data and save into data base or data files, while the member card re-emission system is used to recycle run out member card and reduce cost.
POS机上的数据操作主要是将POS机上的数据转存到数据库或数据文件中，而会员卡再发行系统则可以通过将失效会员卡循环利用，从而保证成本控制。
I do not know how many people are ready to start their low-carbon style, and how many enterprises have begun to re-measure their production and management by using of the carbon emission.
我不知道有多少人准备好现在开始自己的低碳生活、又有多少企业开始用碳排放来重新衡量自己的生产和经营。
In addition to technical means, re-optimizing the allocation of resources is an important way to achieve the energy saving and emission reduction in power generation industry.
除了技术手段之外，资源的优化重组也是实现发电行业节能减排的一个重要途径。
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