Pushbike Danger
Low speed bicycle crashes can badly injure -- or even kill -- children if they fall onto the ends of the handlebars (车把). So a team of engineers is redesigning it to make it safer.
Kristy Arbogast, a bioengineer at the Children’s Hospital of Philadelphia in Pennsylvania, began the project with her colleagues. The cases they reviewed about serious abdominal (腹部的) injuries in children in the past 30 years showed that more than a third were caused by bicycle accidents, "The task was to identify how the injuries occurred and come up with some countermeasures," she says.
By interviewing the children and their parents, Arbogast and her team were able to reconstruct many of the accidents and identified a common cause for serious injuries. They discovered that most cases occur when children hit an obstacle at slow speed, causing them to topple (摇摆) over. To maintain their balance the children turn the handlebars through 90 de
A. they are not beautiful.
B. they may kill children.
C. they are likely to crash.
D. they affect the speed of the bike.
It is difficult to see how one can teach if one is not learning. But there are some distinctions to be made here. To rely on last year’s notes, or -- even worse -- one’s last year’s memory, as if that would always be an adequate basis for passing on knowledge, is to mistake what human knowledge is. 46. And so the assimilation of books, the reading of articles, the pursuit of matters of concern will be crucial to one’s ability to introduce and develop a student’s ability to participate in a specific universe of discourse.
Research might be thought to be another matter especially if it is defined as adding to the sum total of human knowledge. 47. The expansion of higher education which has taken place, and more particularly the expansion which is likely to take place, simply makes it unlikely that all those who are legitimately involved in the teaching and who fulfill their responsibilities utterly in that regard, are themselves all c
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