One reason for the expense is perception: students view price as a proxy for quality; universities worry that low fees will signal a second-rate product.

学费提高的原因之一有关人们的看法：学生视学费为教学质量的代表；大学担心学费低让人以为学校是次品。

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The perception features of double auditory signal transmitted by headphone with overlap method and separate method are discussed in this paper.

本研究探讨了耳机以叠加法和分离法传送双重听觉信号的知觉特点。

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A review will be established in this paper to introduce the perception mechanism, signal transduction ways and feedback regulation of rhizobium Nod factor in leguminous plants.

就豆科植物根瘤菌结瘤因子感知机制、信号转导途径及反馈调控等方面的研究进展进行了全面阐述。

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