Two-stage effect must be passed to be obliged to, g advertisement being going to want to deliver an effect.

本文以“传播的两级效果论”为纲，论述广告要想致效，必须经过两级效果。

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Finally, the effect of the two-stage evaporative cooling system was present, which are both made of porous ceramic material will be more possible to access to the dew point.

最后提出多孔陶瓷间接蒸发冷却器与直接蒸发冷却器复合的二级蒸发冷却系统，其冷却效果更逼近露点。

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This paper studied the effect of prey refuges on the stage-structured predator-prey model with two life stages-immature and mature, and with a mature prey using refuges.

构造了一个具有阶段结构的捕食—食饵模型，并研究了庇护所效应对于该系统平衡点的稳定性、平衡密度及其种群长期续存的影响。

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