Consider what the emission process looks like when viewed reversed in time.

想一想，要是把时间倒转来看，发射光子的过程会变成什么样子呢？

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Based on the test and analysis, this paper gives self similarity feature functions of phonon emission process in quantitative test.

本文在试验基础上，通过分析给出了定量考察声发射过程自相似性的自相似特征函数。

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The total emission rate of one atom during the emission process is calculated as a function of the distance between the atom and the interface.

在辐射过程中，一个原子的总的自发辐射率作为原子和界面之间距离的函数进行了计算。

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So although the cars are technically zero emission, the process of making the hydrogen produces carbon dioxide.

BBC: Apollo's fuel-cell power legacy

Dr Zhou's method, by contrast, employs a process called electron-field emission.

ECONOMIST: Modern X-ray technology