retention/rɪˈtɛnʃən/1保留, 维持the act of keeping something that one already hasCopy同义词： holdingkeeping2保留, 记忆the power of retaining and recalling past experienceCopy同义词： retentivenessretentivitymemory3保留, 液体保留能力the power of retaining liquidCopy同义词： retentivenessretentivity