童心未泯的英文：
to retain a childish heart; still to keep traces of childishness or childlike innocence

retain是什么意思：
v. 保持；保存；记住；雇用
  • orthodontic retainer
    正畸保持器
  • I had one retainer.
    我曾有一个牙齿矫形器。
  • Retained earnings is an owners' equity account that represents accumulated earnings retained in the business.
    留存收益是所有者的权益帐，它表示留在企业的收益积累。
childish是什么意思：
adj. 孩子的；孩子气的；稚嫩的，幼稚的；天真的
  • Crying for things you can't have is childish.
    想要的东西得不到就哭是孩子气的表现。
  • A stupid,disgraceful,or childish act or performance.
    傻事，儿戏，轻率之举愚蠢的，丢脸的或孩子气的行为或表现
  • The vocal part of this song is sung in a childish voice.
    这首歌曲的歌唱部分是用童音进行演唱的。
heart是什么意思：
n. 心，感情，热忱，内心，中心，红桃
  • They exchanged their views heart to heart.
    他们推心置腹地交换了意见。
  • Distance is naught while heart with heart can meet.
    心心能相印，距离等于零。
  • get/learn by heart
    记住,背诵

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