「须菩提！若善男子、善女人，以三千大千世界碎为微尘，于意云何？是微尘众宁为多不？」须菩提言：「甚多，世尊！何以故？若是微尘众实有者，佛则不说是微尘众。所以者何？佛说微尘众，则非微尘众，是名微尘众。世尊！如来所说三千大千世界，则非世界，是名世界。何以故？若世界实有，则是一合相。如来说一合相，则非一合相，是名一合相。」「须菩提！一合相者，则是不可说，但凡夫之人贪著其事。」
逐句解释
三千大千世界碎为微尘，是微尘众宁为多不？
把整个三千大千世界碎成微尘，这些微尘当然多得无法计数。但须菩提立刻用《金刚经》的逻辑回应：如果这些微尘真的是固定存在的，佛就不会说有「微尘众」了——因为微尘众是「A即非A」，不是固定的实体。
If the three-thousand-fold world were ground to dust — those dust particles would be very many. But if they truly existed as fixed entities, the Buddha would not speak of them
Subhuti has so thoroughly internalised the sutra's logic that he applies it spontaneously, without being asked. The dust particles are many — and they are also not fixed entities. Each dust particle is itself a temporary configuration of causes and conditions, just as the world it was part of was. Scale does not change the principle: the smallest and largest things share the same empty nature. Subhuti's ready application of the teaching is itself a demonstration of understanding.
若世界实有，则是一合相。如来说一合相，则非一合相，是名一合相
「一合相」是指把许多微尘聚合成一个整体——也就是「世界」的形成方式。如果世界是真实固定存在的，那它就是一个真实的「一合相」。但如来说的一合相，也是「A即非A」——不是固定的聚合体，所以才叫一合相。这个逻辑从微尘到世界，贯穿了一切尺度。
If the world truly existed, it would be a unified composite. But the Tathagata's unified composite is not a unified composite — therefore it is called a unified composite
A 'unified composite' (一合相) is what you get when you assemble parts into a whole — a world, a body, a society, a self. The point is the same as before: any composite is empty of inherent existence. It is a temporary assembly held together by conditions. When those conditions change, the composite changes or dissolves. There is no permanent 'worldness' in the world, just as there is no permanent 'dustness' in a dust particle. This applies to everything we call a 'thing': every noun is secretly a verb.
一合相者，则是不可说，但凡夫之人贪著其事
「一合相」——世界的真实构成方式——是无法用语言完整说清楚的。但凡夫偏偏执着于这个「合相」，把它当作固定的实体来追求、来依附。这是苦的根源：把暂时的聚合当作永久的实体。
The unified composite is beyond words — yet ordinary people cling to it
The nature of how things actually come together — as temporary, empty, causally conditioned composites — cannot be fully captured in language. Language itself is a set of labels that imply fixed things. But ordinary people do not experience this fluidity; they experience solid objects, permanent selves, and reliable categories. And they cling. Clinging to composites as if they were permanent is the basic structure of suffering: it guarantees disappointment, because the composite will inevitably change or dissolve. The teaching is not 'don't engage with the world' — it is 'engage without grasping, because what you're holding isn't solid anyway.'
总结 · Summary
第三十章把《金刚经》的「A即非A」逻辑应用到物质世界的构成方式：微尘聚合成世界，世界可以碎成微尘——无论哪个尺度，都是暂时的条件聚合，没有固定的本质。「一合相」（聚合体）超越了语言的完整表达，但凡夫执着于它，把暂时的聚合当作永久的实体，这是苦的根源。
Chapter 30 applies the sutra's core logic to the physical world at every scale: dust particles, worlds, and all composites are temporary assemblies empty of inherent existence. The 'unified composite' — how things actually come together — is beyond complete verbal expression, yet ordinary people cling to composites as if they were permanent. This clinging is the structure of suffering. The world is not to be rejected, but engaged without grasping — because what we're holding is not as solid as we think.