岩石在长期的风化作用下逐渐瓦解成小碎片。

The rock underwent gradual ___disintegration into small fragments due to prolonged weathering.

这座古老的建筑因年久失修而开始解体。

The old building is showing signs of ___disintegration due to years of neglect.

长期的压力加速了他的精神崩溃。

Chronic stress accelerated his mental ___disintegration.