《明史·列传·卷一百二十六》
这时，土蛮多次要求上贡和进行双边贸易，关吏不同意，土蛮非常痛恨。
是时，土蛮数求贡市，关吏不许，大恨。
At that time, Tuba had repeatedly requested to pay tribute and engage in bilateral trade, but the customs officers refused, which greatly angered Tuba.