In recent years, railroads have been combining with each other, merging into super systems, causing heightened concerns about monopoly.

近年来，铁路公司相互联合，组成了超大型集团，引起人们对垄断行为的极大关注。

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This phenomenon has aroused heightened concerns from our society.

这种现象已经引起了社会的高度关注。

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Conditions in international financial markets remain difficult, with heightened concerns over credit persisting.

全球金融市场环境依然严峻，过去几个月里，信贷担忧情绪再次浮现。

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These concerns were heightened in June when gunmen fired automatic weapons into a mosque,killing 12 people attending evening prayers.

VOA: standard.2009.08.31

Holbrooke's location in Pakistan personally coming here is a closely guarded secret, given the heightened security concerns following deadly terrorist attacks in Lahore and Peshawar,last week.

VOA: standard.2009.06.03

On the flip side, using credit cards abroad can mean additional fees and heightened concerns about credit card fraud.

BBC: How credit card-friendly is your next destination?

But recent jitters in stockmarkets and commodities markets have heightened concerns that some metal prices have peaked.

ECONOMIST: Mining in Canada

The Euro currency fell to a fresh two-month low Thursday amid heightened concerns regarding the European Union sovereign debt crisis.

FORBES: P.M. Kitco Metals Roundup: Gold Ends Higher, Near Daily High on Fresh Safe-Haven Demand