1. additive for paper making 
   造纸用助剂
2. additive for printing ink 
   油墨用助剂
3. additive theory of number 
   堆垒数论
4. reagent and additive in polymerization 
   聚合助剂
5. A Problem in Arithmetic 
   一个数学问题

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• 1. 加性算术
  心算能力 additive arithmetic...加性算术 arithmetic and harmonic crosses...算术与调和平均数之交叉 arithmetic assignment statement
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• 2. 心算能力
  Phrase ability of mental arithmetic...心算能力 additive arithmetic...加性算术 arithmetic and harmonic crosses
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