Tā yì jiǎng qǐ wǎngshì jiù pǎoyěmǎ, bàntiān huí bú dào zhèngtí.
Once he starts talking about old times, his mind just runs wild and he can't get back to the point.
Xiě wénzhāng zuì jì pǎoyěmǎ, sīlù yào qīngxī.
In writing, nothing's worse than letting your thoughts ramble off; you need a clear line of reasoning.
