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

In the first place, a mask is nearly always occasional.

首先，这个节目几乎是偶然的。

耶鲁公开课 - 弥尔顿课程节选

This is from Andrew at the Occasional.

这名观众名叫安德鲁。

斯坦福公开课 - 经济学课程节选

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

VOA: standard.2010.02.01

The fact is that there are still people in the world many people who regard themselves as Aristotelians Thomists Lockeans Kantians even the occasional Marxist can still be found in Ivy League universities.

事实上，世界上仍有人,很多人自认是亚里士多德学派,托马斯神学派，洛克学派，康德学派，甚至偶尔,还会发现马克斯学派,存在于长春藤联盟的大学中。

耶鲁公开课 - 政治哲学导论课程节选

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