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 ":".
For
example
,
polyphenol
compounds
,
which
widely
exist
in
fruit
,
can
quench
free
radicals
inside
human
body
,
thus
prevent
oxidative
damage
by
free
radicals
.
For:O
example:O
,:O
polyphenol:O
compounds:O
,:O
which:O
widely:O
exist:O
in:O
fruit:O
,:O
can:O
quench:O
free:O
radicals:O
inside:O
human:O
body:O
,:O
thus:O
prevent:O
oxidative:O
damage:O
by:O
free:O
radicals:O
.:O