海
底
扩
张
说
h
á
i
h
ǎ
i
d
ǐ
d
ǐ
k
u
ò
k
u
ò
z
h
ā
n
g
z
h
ā
n
g
s
h
u
ō
s
h
u
ō
Definitions
1. theory of seafloor spreading (geology)
Components
海底扩张
hǎi dǐ kuò zhāng
–
seafloor spreading (geology)
说
shuō
–
to speak