不
首
先
使
用
b
ù
s
h
ǒ
u
x
i
ā
n
s
h
ǐ
y
ò
n
g
Definitions
1. no first use (policy for nuclear weapons)
2. NFU
Components
不
bù
–
(negative prefix)
首先
shǒu xiān
–
first (of all)
使用
shǐ yòng
–
to use