His writing and speaking raised the awareness of the importance of conservation and helped bring about our national park system.

他的写作和演讲提高了人们对保护自然的重要性的认识，并帮助建立了我们的国家公园系统。

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The New York State parks system wants to turn off the falls on the American side to replace two 115-year-old stone bridges that allow pedestrians, park vehicles and utilities access to Goat Island.

纽约州公园系统希望关停美国一侧的瀑布，以取代两座有115年历史的石桥，让行人、公园车辆和公共设施可以进入山羊岛。

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A bit further back, Teddy Roosevelt founded the national park system, among other efforts to conserve the natural heritage of the United States.

再稍往前，连同保护美国自然遗产的努力，泰迪·罗斯福建立了国建公园制度。

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Last year, almost two hundred seventy-five million people visited the national park system in the United States.

VOA: special.2009.09.28

The park system includes more than three-hundred-seventy protected areas.

VOA: special.2010.01.04

Ford's outfitted the Fusion Energi with a dizzying array of driver-assist tech, including a lane-keeping system, adaptive cruise control, driver alert system, active park assist, rear camera, blind-spot indicator system with cross-traffic alert and pull-drift compensation (phew).

ENGADGET: Ford Fusion Energi plug-in hybrid test drive (video)

Teens design pedal-powered filtration system: High-schoolers Payton Karr and Kiona Elliot , from Oakland Park, Florida , led a team of inventors who designed a collapsible, transportable, bicycle-powered emergency water-sanitation station that filters E. coli and other harmful pathogens from contaminated water.

WHITEHOUSE: The White House

It is best to follow a child's lead when answering questions, says Victor Fornari, a child psychiatrist at North Shore-LIJ Health System in New Hyde Park, N.

WSJ: How to Talk to Your Children About the Shootings