in·ces·san·cy /(ˌ)ɪnˈsɛsṇ(t)si/
incessancy
不間斷性
In·ces·san·cy n. The quality of being incessant; unintermitted continuance; unceasingness.
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incessancy
n : the quality of something that continues without end or
interruption [syn: continuousness, ceaselessness, incessantness]