metabolism (biology); the new replaces the old (idiom)
新 · 13 strokes
Phonosemantic component. 辛 represents the sound, and 斤 (axe) and 木 (tree) represent the original meaning "firewood", now written as 薪. The meaning later shifted to "fresh" and "new".
陈 · 7 strokes
Simplified form of 陳. Composed of 阝 and 东. The purpose of 东 is unclear.
代 · 5 strokes
Phonosemantic compound. 亻 represents the meaning and 弋 represents the sound.
谢 · 12 strokes
Simplified form of 謝. Phonosemantic compound. 言 represents the meaning and 射 represents the sound.
细胞新陈代谢是正常的生理现象。
metabolism (biology); the new replaces the old (idiom)