By interviewing the children and their parents，Arbogast and her team were able to　reconstruct many of the accidents and identified a common mechanism responsible for serious injures. They discovered that most occur when children hit an obstacle at a slow speed，causing them to topple over. To maintain their balance they turn the handlebars through 90degreesbut their momentum forces them into the end of the handlebars The bike then falls over and the other end of the handlebars hits the ground，ramming it into their abdomen.

　　The solution the group came up with is a handgrip fitted with a spring and damping system. The spring absorbs up to 50 per cent of the forces transmitted through the handlebars in an impact，The group hopes to commercialize the device，which should add only a few dollars to the cost of a bike. But our task has been one of education because up until now, bicycle manufacturer were unaware of the problem，says Arbogast.

　　The team has also approached the US Consumer Product Safety Commission to try to persuade manufacturers to adopt the new design A decision is expected later this year.

　　词汇：

　　handlebar n车把

　　abdominal adj 腹部的

　　redesign v 重新设计

　　bioengineer n 生物工程师

　　reconstruct vt.重建;重构

　　countermeasure n 对策

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