retention

noun

the act of retaining something
何かを保持すること
the power of retaining liquid
流体を保持する力
- moisture retentivity of soil
  土壌の水分保持力
the power of retaining and recalling past experience
過去の経験を保持し思い出すことができる力
- he had a good memory when he was younger
  彼がもっと若かったときは、記憶力が良かった

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