Experts say a lack of charging stations and battery quality remain the primary barriers to long-distance driving and greater penetration of the market.

专家认为，缺少充电站以及电池质量是长距离行驶以及新能源汽车普及率上升的主要障碍。

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The initiative was designed to remove school fees and other barriers that kept primary children out of school.

VOA: standard.2010.03.04

"One of the primary barriers to mainstream adoption of connected TVs has been the lack of good content, " said Rob DelaCruz, General Manager, Connected TV and Mobile Video, The AOL On Network.

ENGADGET: AOL HD connected TV app is now AOL On for Samsung, Roku and Sony; TiVo coming soon

Our results suggest that informational barriers were a primary factor in explaining this lack of adoption.

FORBES: Does Management Matter?

Two County Tyrone primary schools have been told there are no legal barriers to them merging.

BBC: No barrier over Catholic and Protestant schools merger