It sounds like it's extremely old. So probably some pages are at the point of crumbling into dust?

听起来它好像非常古老。那么，也许有些书页到了即将碎成粉末的程度？

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Infrastructure is crumbling even at top schools like the famed Indian Institutes of Technology, where once cutting-edge laboratories have grown obsolete.

甚至在顶级的著名学府：印度科学技术学院基础设施破败不堪，那里一度尖端的实验室也荒废了。

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Out went crumbling terracing; in came safer seating and improved facilities that made fans feel more like spectators than animals.

阶梯看台被推倒；取而代之的是安全的座位和改进的球施，让球迷感觉到自己更像是观众而不是动物。

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Facebook, for one thing, is not going to spend its new pile of shareholder cash on buying a rickety, crumbling contraption like RIM.

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He says that crumbling up the course like this forced him to study his own teaching more than he had at the lectern.

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Its concrete tower blocks were crumbling, the peasant housing like slums, and the infrastructure chronically rundown.

BBC: New horizons in Kazakhstan