Assertion: cormorant's number | /r/HasProperty | threatened by use of ddt
Facets:
Source sentences:
text: Once threatened by use of DDT, the numbers of this bird have increased markedly in recent years.
text: Once threatened by the use of DDT, the numbers of this bird have increased markedly in recent years.
text: Once threatened by use of DDT, the numbers of this bird have increased markedly in recent years.