《新唐书·列传·卷三十二》
吐蕃贪心蜀州的富裕，早就想去进行抢掠，只是因为悬崖山道险要到了极点，贪馋的嘴巴吞吃不到。
吐蕃爱蜀富，思盗之矣，徒以障队隘绝，顿饿喙不得噬。
The Tubo coveted the wealth of Shuzhou and had long wanted to plunder it, but because the road to the cliff is extremely steep, the greedy mouth cannot swallow it.