| 词条 | If I Knew Then (Backstreet Boys song) |
| 释义 | > This Is Us (Backstreet Boys album){{R from song}} 5 : 2010 songs|Songs written by Claude Kelly|Songs written by Kenneth Karlin|Songs written by Soulshock|Backstreet Boys songs |
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开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。