Switzer says that the industrial nature of gas drilling, with heavy truck traffic and noise, and occasional wastewater and chemical spills,has transformed their peaceful country life.

VOA: standard.2010.01.02

Hershey says chicken went from being an occasional luxury to an everyday meal.

VOA: standard.2010.02.01

Occasional accidents have raised concerns about their safety.

VOA: standard.2009.11.11

U.S.officials, including the number-two American commander here, Army Lieutenant General Charles Jacoby, say such occasional spectacular attacks are,in a way, evidence of the decline of al-Qaida in Iraq, which once staged dozens of attacks every day.

VOA: standard.2009.12.11