The Chinese phrase "不能不" is a double-negative grammatical construction formed by combining the negative adverb "不" (bù, meaning "not") with the modal verb "能" (néng, meaning "can" or "to be able"), and then repeating this pattern. Literally, it translates as "cannot not," where the first "不" negates "能" to create "cannot," and the second "不" negates the following verb. This structure follows a logical formula similar to "not unable to" and functions as an emphatic positive, ultimately meaning "must," "have to," or "cannot help but." It is a fixed idiomatic expression used to convey strong necessity, compulsion, or inevitability, demonstrating how Chinese often uses layered negation for rhetorical emphasis rather than straightforward affirmation.