Because of support directional situation of barrel recoil and counter-recoil is different, so influence on gun fire dispersion is different.
由于身管后坐复进运动中支撑定向情况的不同，对火炮的射击密集度产生的影响也不相同。
Slow light can be generated by counter-directional coupling between a silica wire and a two-dimensional (2D) silicon photonic crystal slab waveguide.
在二氧化硅线和二维硅光子晶体条形波导间的反向耦合可产生慢光。
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