1. While Ζ S 1S 2 cos (Δα)/PCV max, preying relationship absents, the former Eqs. shows two species in the same trophic level and the latter in more than one trophic level.
当ΖS1S2cos（Δα）/PCVmax时，不存在捕食关系，前式为同一营养级，后式为相隔一个至几个营养级。
2. I don't enjoy a victory less because someone is not there. and: les absents ont Toujours tort.
我并不因为别人的缺席而觉得胜利有什么不同。还有：缺席总是不好的。
3. While Ζ S 1S 2 cos (Δα) / PCV max, preying relationship absents, the former Eqs. shows two species in the same trophic level and the latter in more than one trophic level.
当ΖS1S2cos（Δα）/PCVmax时，不存在捕食关系，前式为同一营养级，后式为相隔一个至几个营养级。