Underline as a kind of highlighting, has a significant positive effect on the performance of visual search, especially in the condition of high difficulty level.

在高难度水平下的视觉搜索作业中，下划线对被试的视觉搜索绩效的促进作用更为明显；

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Edward Lawler at the University of Southern California says these companies may now have difficulty getting and keeping high-quality employees.

VOA: special.2009.10.30

"There's a high level of difficulty because of the unknowns, " said Gary Snow, a project manager with Washington Closure Hanford, the federal contractor managing the effort to deal with the newfound waste.

WSJ: Toxic Radioactive Find Adds to Hanford Cleanup Woes

As a result of this difficulty, investing in high-tech stocks that have been on a correction mode can be both very rewarding and very risky.

FORBES: Two Ways to Separate Value from Vice Among High Technology Stocks

The report cites high taxes and the difficulty of getting electricity and enforcing contracts as particularly steep hurdles.

FORBES: Billionaire Ciputra Trains Indonesian Migrant Workers to Be their Own Boss