With no explanation, label each line with "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport", "building-hospital" or "building-hotel" preceded by ":".
Its
focus
is
nature
and
science
discovery
,
emphasizing
to
viewers
how
they
can
affect
their
own
environment
.
Its:O
focus:O
is:O
nature:O
and:O
science:O
discovery:O
,:O
emphasizing:O
to:O
viewers:O
how:O
they:O
can:O
affect:O
their:O
own:O
environment:O
.:O