1. continuing at full strength or intensity. 
   保持全部力量或维持原有强度。
2. the amount of energy required to maintain the body of an individual in a resting state. 
   维持个体保持静止状态所需要的能量。
3. To keep in perfect or unaltered condition; maintain unchanged. 
   保存保持处于完善或不变的状况中；维持不变
4. He has maintained a high batting average in gaining and holding the friendship among his colleagues. 
   他在获得并维持同事的友谊上，保持了良好的成绩。
5. And any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life. 
   这种知识不能保持那种维持生命所需要的温度。

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• 1. maintain
  264. core n. 果心，核心...265. maintain vt. 維持，保持；堅持，主張...266. mainland n. 大陸
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• 2. retain
  retain v. 保留；保持
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• 3. preserve
  statues 雕像...preserve 保护，保持，维护...identity 身份
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• 4. keep up
  keep track of通晓事态，注意动向...keep up保持，维持；继续进行；坚持...keep/be abreast of/with(使)跟上，与…保持并列，不落后于
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