It is the focus to get eigen equation of all kinds cross section waveguide in guide wave optics.

求解各类截面波导的本征方程，一直是导波光学研究的焦点问题。

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In forward modeling, the scatter and absorption of electromagnetic wave in medium are considered, which brings realer synthetic section.

在正演过程中，考虑了电磁波在介质中的散射和吸收，使合成剖面更真实化。

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Fish net bag made a picture of the children to shake off the hands of play, along with the wave, a section of shiny silver fish is a net.

一张张自制的鱼网兜在孩子们手里挥来挥去，伴随着挥动，一条条银光闪闪的鱼儿被网住了。

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The fast flowing water of the Eisbach ploughs into a deeper section of the river that barely moves at all, creating a consistent, albeit dangerous, wave effect.

BBC: Riding the wave of change on Munich��s Eisbach

The fall of the wall was a kind of year zero for Berlin and was followed by a wave of optimism, illustrated by the murals from that era at the East Side Gallery (the longest section of the Berlin wall still standing), but the integration of the relatively impoverished eastern section hasn't been easy and is an ongoing process.

CNN: Berlin: City overview