11.   Figuring out how many elements can exist has been an eternal goal of science, shedding light on how the universe evolved and the structure of atoms.

12.   Ninety-four elements exist in nature.

13.   Radical elements do exist in Saudi society, but their size and organization are hard to judge since Saudi Arabia does not comment on internal security matters.

n. + exist >>共 1655
problem 4.39%
evidence 2.06%
possibility 1.59%
opportunity 1.28%
difference 1.17%
life 1.15%
condition 1.10%
technology 1.04%
system 0.84%
group 0.78%
element 0.21%
element + v. >>共 278
be 53.67%
have 2.42%
make 1.92%
include 1.78%
come 1.57%
seem 1.21%
remain 1.14%
exist 0.93%
become 0.64%
create 0.57%
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