第三章折现率定义及内涵辨析，有对折现率含义、特性、假设、影响因素、构成要素以及相近词语的辨析等；
The meaning of the discount rate is introduced in chapter III as well as the characteristic, the supposition, the influence factors of it and discrimination of the close words.
学完本册，学生可以掌握500多个生词、近40个重点词语或语法、24个常用语素和近100个相关词语、27组近义词辨析以及30多个成语。
The students can learn over 500 new words, nearly 40 key words or grammar, 24 commonly-used morphemes and nearly 100 relevant words, 27 sets of synonym discriminations and over 30 idioms.
学完本册，学生可以掌握500多个生词、近40个重点词语或语法、24个常用语素和近100个相关词语、27组近义词辨析以及30多个成语。
The students can learn over 500 new words, nearly 40 key words or grammar, 24 commonly-used morphemes and nearly 100 relevant words, 27 sets of synonym discriminations and over 30 idioms.
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