As the research progresses, Roy says he'd like to add a collision-avoidance system using detectors to prevent the chair from bumping into other wheelchairs, walls or other obstacles.

随着进一步的研究，Roy称，他将会对轮椅系统增加防撞探测器，以防撞到其它轮椅、墙壁或者其它障碍物。

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Meteorologists were blaming the nor'easter on the collision of two storm systems: cold air traveling south from Canada bumping into a moist low pressure system heading north from the Carolinas.

WSJ: Major Blizzard Bears Down on Northeast