So it's been forced to rely on "intelligent guesswork".
Commentators have largely been forced to rely on anecdote.
They've been forced to rely on shaky memories and vague recollections for their data.
I dare say I should have been forced to rely on laudanum.
It has been forced to rely on its experience with anthrax as a naturally occurring illness.
While African farmers wait for the approval of GM maize they have been forced to rely on additional pesticides.
With reduced velocity, Sabathia has been forced to rely on guile and pitch location to try to outwit opponents.
The government has increasingly been forced to rely on the airport, which it still controls, opposition activists said.
"If we had been forced to rely on the Lebanese government, this area would still be in ruins".
Transit has been forced to rely on fluctuating taxes from real estate and other sources and, increasingly, rising fares.
Farmers in India had been forced to rely on traditional modes for reaching customers, dealing with traders and middlemen.
