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
helpful (adj.)
[helpful 词源字典]
late 14c., from
help
(n.) +
-ful
. Related:
Helpfully
;
helpfulness
.
[helpful etymology, helpful origin, 英语词源]
[helpful 词源字典]