jiào / shòu / yòng / tū / biàn / lǐ / lùn / jiě / shì / le / shì / chǎng / jià / gé / wèi / hé / huì / tū / rán / biàn / huà

教授用突变理论解释了市场价格为何会突然变化。

The professor used catastrophe theory to explain sudden changes in market prices.