Metabolism; the process of replacing the old with the new.
陈陈旧的；代替换；谢凋谢，衰亡。指生物体不断用新物质代替旧物质的过程。也指新事物不断产生发展，代替旧的事物。
毛泽东《矛盾论》世界上总是这样以新的代替旧的，总是这样新陈代谢、除旧布新或推陈出新的。”
Learning a new language involves a constant metabolism of vocabulary.
Learn the next connected idiom: 新陈代谢 (xīn chén dài xiè) → 谢天谢地 (xiè tiān xiè dì)
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