【化】 S-E1机理; 单分子亲电子取代反应机理

counter-current multiplication mechanism【生理】

offset circle of cam mechanism【机】

钟表\nescapement【仪】;escapement mechanism【仪】

driving mechanism for push-button switches with click-stop device

operating mechanism

S-R mechanism

winding mechanism (winding device, winding apparatus)

detaching mechanism【机】;disengaging gear【机】;release mechanism【机】