they do not know how to use the dictionary . the girl who is dancing is my sister
1、They don't know how to use dictionary,2、The dancing girl is my younger sister.
They do not how to use d....
1.
They
don't
know
how
to
use
dictionaries.
（或者a
dictionary)
2.
The
girl
who
is
dancing
is
my
younger
sister.
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