It's worth nothing that 翻译

It's worth nothing that 翻译It's worth nothing that Amazon.com sold more Kindles (at least 500,000) in its first year of sales than Apple sold iPods in its first year(378,000).这句话的翻译是"值得注意的是,亚马逊公司的Kindles第一年的销售量(至少50万台)超过了苹果公司iPods第一年的销售量(37.8万台)."为什么It's worth nothing that 会翻译为"值得注意的"?而不是"毫无意义的"?