This structure can form a wave-guide in photon crystals and light can propagate in it with different selected frequency in photonic band gap with low loss.
该结构在光子晶体中构成光波导，能使光子禁带中不同的被选择的缺陷态频率的光子以极低的损耗通过。
It is easy to observe slow P-wave in the condition of large porosity and low frequency band.
低频、高孔隙度条件更有利于慢纵波的观测。
Short wave is radio frequency band earliest utilized by human being, and short wave communication is one modern communication method with a long history.
短波是人类最早开发利用的无线电频段，短波通信是历史最为悠久的现代通信手段之一。
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