容量：4GB 尺寸：91（长）x 51（阔）x 14（厚）mm 重量：102g 第四代 (iPod with Click Wheel) 第四代iPod 2004年7月19日于美国上市。斯蒂夫·乔布斯使用新的宣传途径，它成为了新闻周刊的杂志封面。
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ipod with click wheel
带滚轮的IPod
以上为机器翻译结果，长、整句建议使用 人工翻译 。
With the release of the sixth-generation (6G) iPod nano, the line has received its most dramatic redesign yet, and the Click Wheel is nowhere to be found.
随着第六代（6G）iPod nano 的发布，这条产品线有了史无前例的大变化，而触控轮不复存在了。
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The original iPod is known for its famous click-wheel, which helped users scroll through their music library with ease.
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