Child's play的缩写

Child S Play的《Wind》 歌词 The job is child's play.child's play Love you are not child's play! 请精通英语俚语的朋友帮忙翻译一下：child's play的意思及来由? we play happily on child's day错误在哪 child's play等于哪个短语?跪求答案啊 S是什么的缩写 lt's的缩写 he's的缩写 she's的缩写 what ‘s的缩写 英语翻译the child may be invited to play at his friend's house l