器官移植日益推进了年龄的限制并且将需要的器官移植到年龄越来越老的身体中。就象婴儿的数量越来越多一样。这既是需要，也是边缘尖锐的顾虑。
Transplant surgeons are increasingly pushing age limits and putting organs into older and older bodies as the baby boomers seek, and demand, cutting-edge care.
如果一个人使用未经消毒或肮脏的切割工具——剃刀、剪刀、别针，甚至是一听汽水标签的尖锐边缘，切割可能会导致感染。
Cuts can become infected if a person USES nonsterile or dirty cutting instruments - razors, scissors, pins, or even the sharp edge of the TAB on a can of soda.
如果我的谈话过于尖锐，那是因为我相信尼日利亚有一次濒临崩溃的边缘。
If there is a stridency in what I say it is because I believe Nigeria is once again on the brink of a precipice.
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