1. To reduce(nitrates or nitrites) to nitrogen-containing gases, as by bacterial action on soil. 
   使变成含氮气体（将硝酸盐或氮化物）变成含氮气体，例如通过对土壤的细菌作用
2. military action involving the use of electromagnetic energy to determine or exploit or reduce or prevent hostile use of the electromagnetic spectrum. 
   用电磁能量来探测、开发、减少或阻止敌人用电磁谱的军事行动。
3. reduce in size; reduce physically. 
   在尺码上减小；在物理上减少。
4. To reduce study load 
   学生减负
5. Aspirin can reduce fever. 
   阿司匹林可以退烧.

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• 1. 归约动作
  缩减；归约 reduce...归约动作 reduce action...归约自动机 reduce automaton
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