quword
趣词
Word Origins Dictionary
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
iff
[iff 词源字典]
"If and only if", 1950s: arbitrary extension of
if
.
[iff etymology, iff origin, 英语词源]
[iff 词源字典]