循环
xúnhuán · HSK 6
circulate
🔄♻️ xun-huan sounds like soon-wander — blood soon wanders back around the loop
循 means follow/patrol and 环 means ring/loop. Together: following a ring path, i.e. cycling or circulating. Your blood follows the ring of vessels and returns to the heart — a循环 (cycle).
环 — jade radical 玉/王 + 睘 (huán phonetic)
环 is a phono-semantic compound. The left side 王 (a form of 玉 'jade') gives the meaning, since the original sense was a circular jade ring worn as an ornament. The right side 睘 supplies the sound 'huán'. From 'jade ring' the meaning broadened to 'ring, loop, encircle,' and in modern Chinese also 'environment' in 环境.