Tray refills go for $25.99 each or $74.99 for three. That $26 per month may not be a totally egregious bill for a one-cat household only using one tray per month. But it's significantly costlier than a traditional litter box setup — $26 could get you like 80 pounds of clumping clay litter. The recurring cost adds up even more for multi-cat households that require more frequent tray swaps.
再比如互文，我也有解释。《神奇收费亭》的作者很可能是看过《夏洛的网》，所以《神奇收费亭》中的懒散精灵，几乎是《夏洛的网》中威尔伯的翻版。
。业内人士推荐新收录的资料作为进阶阅读
在伊东屋的逻辑里，创造力来自人类五感的真实刺激。种菜和写字，本质上卖的是同一种东西——“真实的物理生长感与摩擦力”。
Navigating the context switching