I　like　to　listen　to　music.　But　many　songs　stored　in　my　MP4　may　remind　me　of　something.　Man,　in　a　sense,　lives　in　memory.　However,　these　memories　have　been　stored　forever,　and　you　can't　forget　them.　They　may　pop　up　from　time　to　time　to　tap　your　heart.　It's　a　kind　of　feeling　beyond　words.