滔滔不绝

大家围坐在一起热情地滔滔不绝着未来的计划。

dà jiā wéi zuò zài yì qǐ rè qíng dì tāo tāo bù jué zhe wèi lái de jì huà.

Everyone sat together, enthusiastically talking about future plans.

一谈起自己沉醉钻研了数十载的中国古代天文历法演进史，平日里沉默寡言的老先生顿时神采奕奕、滔滔不绝。

yī tán qǐ zì jǐ chén zuì zuān yán le shù shí zài de zhōng guó gǔ dài tiān wén lì fǎ yǎn jìn shǐ, píng rì lǐ chén mò guǎ yán de lǎo xiān shēng dùn shí shén cǎi yì yì, tāo tāo bù jué.

When he talked about the evolution of ancient Chinese astronomy and calendar, which he had been studying for decades, the usually taciturn old man suddenly became energetic and eloquent.