lǎo shī / jiě shì / le / zhè ge / zì / de / tōng jiǎ / yòng fǎ / ràng / wǒ men / huò rán kāi lǎng

老师解释了这个字的通假用法，让我们豁然开朗。

The teacher explained the phonetic loan usage of this character, and suddenly we understood.