微
扰
展
开
w
ē
i
w
ē
i
r
á
o
r
ǎ
o
z
h
ǎ
n
z
h
ǎ
n
k
ā
i
k
ā
i
Definitions
1. perturbative expansion (physics)
Components
微扰
wēi rǎo
–
infinitesimal disturbance
展开
zhǎn kāi
–
to unfold