Condition A – Like New
A secondhand book in excellent condition with little to no signs of use. It may be sealed or unsealed, but appears unread and nearly new.
二手书，接近全新，几乎没有使用痕迹。可能有包装或无包装，但整体外观如未使用。

Condition B – Very Good
A secondhand book in very good condition. May show minor signs of use such as slight discoloration, light creasing, or minimal annotations/highlighting.
二手书，状况很好。可能有轻微使用痕迹，如轻微褪色、轻微折痕或少量笔记／荧光标记。

Condition C – Good
A used book in good condition with visible signs of wear. May include moderate creasing, discoloration, annotations, or highlighting. All content remains complete and readable.
二手书，状况良好，有明显使用痕迹。可能有中等程度的折痕、褪色、笔记或荧光标记，但内容完整且不影响阅读。

Condition D – Acceptable
A heavily used book with significant wear. May include heavy discoloration, creasing, weak binding, and extensive annotations or highlighting. All pages are intact and readable.
二手书，使用痕迹明显，磨损严重。可能有严重褪色、折痕、装订松散，以及大量笔记或荧光标记，但页面完整且仍可阅读。