Problem: Wwo sentences:
At last week 's meeting with U.S. President George W. Bush , Roh said inter-Korean exchanges would be " conducted in light of developments on the North Korean nuclear issue . "
The two leaders said inter-Korean exchanges would be " conducted in light of developments on the North Korean nuclear issue " .
Do they have the same meaning?

Answer: yes

Problem: Wwo sentences:
Some 26.5 million shares changed hands , more than three times the daily average over 10 days of 6.8 million .
Some 11.8 million shares have changed hands , well above its daily average over 10 days of 6.8 million .
Do they have the same meaning?

Answer: yes

Problem: Wwo sentences:
Canadian researchers ordered the slaughter of more than 2,000 cows and conducted an extensive investigation but were not able to find evidence of any other infected animals .
Canadian investigators slaughtered more than 2,000 cows but were not able to find evidence of any other infected animals .
Do they have the same meaning?

Answer: yes

Problem: Wwo sentences:
Security forces stormed the building , but 129 hostages were killed along with the attackers .
Russian forces stormed the building to free the hostages but 129 people died in the operation .
Do they have the same meaning?

Answer:
no