With the exploitation of high sulfur gas fields, the working environment of tubing and casing gets worse and more com-plicated.

随着高含硫油气田的开发，油套管的工作环境也趋于恶劣和复杂。

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For example,the Web site petswelcome.com lists more than seventeen thousand pet friendly hotels,campgrounds and beaches in the United States.

VOA: special.2009.02.23

Or send your e-mails to unsv@qq.com Join us again next week for more news about science in Special English on the Voice of America.

VOA: special.2010.01.12

These services are widely used. Turnitin.com,for example, says it is used in more than one hundred countries and examines more than one hundred thirty thousand papers a day.

VOA: special.2009.04.16

CreditReport.com and FreeCreditScore.com attracted more than three million unique visitors in January, according to NetBanker.com, far more than the two million visitors to AnnualCreditReport.com, where consumers can get free copies of their credit reports annually.

WSJ: Getting Going: The Financial Fear Mongers

In addition to this blog, I also write articles on the financial aspects of divorce for The Huffington Post and More.com.

FORBES: Divorcing Women Need to Answer These Key Questions Before Deciding to Keep The House

Its comprehensive list ranks 160 such companies, ranging from well-known Groupon competitors like LivingSocial.com and BuyWithMe.com to more recent entrants and niche players like GaggleOfChicks.com and Mamapedia.com.

FORBES: Groupon Said To Spawn More Than 180 Clones In U.S. Already