11.   He used a tiny doll-sized optical instrument to penetrate the amniotic sac of the plump twin.

n. + of >>共 1368
number 2.42%
thousand 1.43%
hundred 1.22%
most 1.18%
group 0.86%
series 0.84%
use 0.80%
head 0.77%
sign 0.72%
side 0.70%
sac 0%
sac + p. >>共 16
of 32.35%
in 14.71%
around 8.82%
inside 5.88%
on 5.88%
as 2.94%
before 2.94%
behind 2.94%
beneath 2.94%
down 2.94%
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