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
pdf
[pdf 词源字典]
by 1992, initialism (acronym) for
portable document format
, a generic term.
[pdf etymology, pdf origin, 英语词源]
[pdf 词源字典]