Wùlǐxué zhōng de ǒuhé zhǐ liǎng gè xìtǒng zhījiān de xiānghù zuòyòng.
In physics, 'coupling' refers to the interaction between two systems.
Tips
usage
Two distinct registers. Classical: 耦耕 (two-person ploughing), famous from 《论语》 - 长沮桀溺耦而耕 (the recluses 'plowed in pairs'). Modern STEM: 耦合 (coupling) is the standard physics / engineering / software-architecture term - 强耦合 (tight coupling), 解耦 (decoupling). Same character, very different worlds.
mistakes
耦 and 偶 sound identical but split semantic duty: 耦 for technical 'coupling' and classical 'plough-pair'; 偶 for 'mate / spouse / coincidence' (配偶, 偶然). Don't write 偶合 when you mean the engineering term - that means 'fortuitous coincidence'.
Left 耒 (Kangxi #127) - the plough-handle radical, depicting an angled wooden hoe. Anchors the agricultural sense of two-person plowing. Same radical drives 耕 (plough), 耘 (weed), 耙 (rake).
