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if and only if

gen. 如果仅仅如果语句
el. ★ 当且仅当
oil 数学用语当且仅当
"if and only if"
busin. "即使只要"
if-and-only-if
telecom. 等同
 English thesaurus
if and only if
abbr. iff (Vosoni)
if and only if
: 2 phrases in 2 subjects
Business1
Watchmaking1

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