变

to change / to become different / to transform / to vary / rebellion

also

(once) again / also / both... and... / and yet / (used for emphasis) anyway

nothing much changes (idiom); always the same / stuck in a rut

(idiom) immutable; impervious to change; set in stone

incident / unforeseen event / events (in general)

(idiom) to deal with varying circumstances by adhering to a basic principle

many superficial changes but no departure from the original stand (idiom); plus ça change, plus ça reste la mème chose

invariably

constant capital

invariant quantity / invariant (math.)

radical change

Shanghai Incident of 28th January 1932, Chinese uprising against Japanese quarters of Shanghai

global warming

the Mukden or Manchurian Railway Incident of 18th September 1931 used by the Japanese as a pretext to annex Manchuria / also known as Liutiaogou incident 柳條溝事變|柳条沟事变

unchanging since times immemorial (idiom) / unalterable / unvarying / monotonous

half-period of a wave motion / alternation

alternating current / same as 交流電|交流电

alternating current (electricity)

Marco Polo Bridge Incident of 7th July 1937, regarded as the beginning of the Second Sino-Japanese War 抗日戰爭|抗日战争[Kang4 Ri4 Zhan4 zheng1]

to show no understanding of the times (idiom); cannot adapt to current circumstances / not amenable to reason

constant / unvarying / (math.) invariant

fixed price / constant price