一句话从生涩说到熟练一首歌从深情唱到敷衍
[yī jù huà cóng shēng sè shuō dào shú liàn yī shŏu gē cóng shēn qíng chàng dào fū yăn]
This describes the process of becoming familiar with something over time. It compares how one's expression of emotions changes, from initially being awkward to becoming fluent in speech and from singing with deep emotion to becoming less heartfelt. It reflects a sense of personal growth or disillusionment.