守恆定律

conservation law (physics)

to guard / to defend / to keep watch / to abide by the law / to observe (rules or ritual) / nearby / adjoining

conservation (e.g. of energy, momentum or heat in physics) / to remain constant (of a number)

surname Heng

permanent / constant / fixed / usual / ordinary / rule (old) / one of the 64 hexagrams of the Book of Changes (䷟)

constant

to set / to fix / to determine / to decide / to order

scientific law (e.g. law of conservation of energy) / (in human affairs) a generalization based on observation (e.g. "power corrupts")

surname Lü

law