童心的英文：
childishness; childlike innocence

参考例句：

Even if your hair is snow, Daddy, you can still be a boy.
爸爸，即使你满头白发，你还可以有童心。

If you carry your childhood with you, you never become older. —— Abraham Sutzkever
你如果保持童心，则永不会老。——萨兹克沃

childishness是什么意思：
n. 天真;幼少;傻气

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。

childlike是什么意思：
a. 孩子似的，天真烂漫的

She pulled her face into a placating and childlike expression.
于是她装出一副稚气的想要和解的样子来。

A childlike innocence shone out of his handsome eyes.
一束孩童般的天真无邪的光从他那双俊秀的眼睛里闪耀出来。

The soldiers were grateful and docile, made almost childlike by their wounds.
士兵们都很感激，很听话，因为受伤，都变得像孩子似的。

innocence是什么意思：
n. 清白；天真无邪；无知，幼稚

Innocence is bliss.
无知便是福。

Satisfy the police that one is innocent/as to one's innocence.
向警方证实自己是清白的。

She was wearing an innocent smile.
她带着天真的笑容。