shōu zhǎi fàn wéi, bǐ rú yī gè chéng shì, yī gè píng tái, yī gè àn lì, fǎn ér gèng róng yì jiǎng shēn

收窄范围，比如一个城市、一个平台、一个案例，反而更容易讲深。

Narrowing the scope, such as a city, a platform, or a case, actually makes it easier to go deeper.