Problem: Wwo sentences:
Tech stocks were hurt by a sour forecast from Sun Microsystems , which was viewed as a bad omen for the upcoming quarterly earnings season .
A sour forecast from Sun Microsystems Inc . SUNW.O put more pressure on Wall Street before the quarterly earnings season .
Do they have the same meaning?

Answer: yes

Problem: Wwo sentences:
UBS Warburg downgraded Altria , a Dow member , to " neutral " from " buy , " based on valuation .
It fell 0.5 percent after UBS downgraded it to " neutral " from " buy , " citing valuation .
Do they have the same meaning?

Answer: no

Problem: Wwo sentences:
Authorities in Alabama said the passage of time , and the transfer or retirement of some investigators , has not hurt their case .
Meantime , federal authorities in Alabama said the passage of time has not hurt their case against Rudolph .
Do they have the same meaning?

Answer: no

Problem: Wwo sentences:
They had published an advertisement on the Internet on June 10 , offering the cargo for sale , he added .
On June 10 , the ship 's owners had published an advertisement on the Internet , offering the explosives for sale .
Do they have the same meaning?

Answer:
yes