1. an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet. 
   动物所需但自身不能合成的氨基酸，必须通过食物进行补充。
2. The second step is to synthesize the data of perception by arranging and reconstructing them; this belongs to the stage of conception, judgement and inference.  
   第二步，是综合感觉的材料加以整理和改造，属于概念、判断和推理的阶段。
3. Being a substance that is required for normal functioning but does not need to be included in the diet because of the body's ability to synthesize it from other nutrients. 
   （氨基酸）非必需的是正常的运转所需要的物质的，但因为机体有从其它营养成分合成它的能力，因此不需要被包括在日常的食物中的
4. The great value of the mammary gland is that it can synthesize the very large quantities of complex proteins, such as antibodies that are needed for therapeutic or diagnostic purposes. 
   乳腺的最大价值是能够合成大量复杂的用于治疗或诊断目的的蛋白质，例如抗体。
5. We should regularly sum up historical experience, carry out intensive surveys and studies and synthesize the correct views so as to continue the reform vigorously and systematically, step by step from the central level on down. 
   我们要不断总结历史经验，深入调查研究，集中正确意见，从中央到地方，积极地、有步骤地继续进行改革。

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• 1. 综合
  5.superfluous [7sju:5pE:fluEs] a. 多余的，不相干的，过剩的...6.synthesize [5sinWisaiz] vt. 综合...选择你所喜欢的
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• 2. 合成
  synthesis 综合法合成...synthesize 合成...synthesizer 合成器
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• 3. 合成，综合
  symptomatology 症状学...synthesize 合成，综合...temporarily 碱中毒
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• 4. 综合，使合成
  judgment: n.审判，裁决，判决...synthesize: v.综合，使合成...overturn: v.1.使翻转，使倾覆 2.颠覆，推翻，废除，使无效
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