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A laser beam can completely destroy a cancerous growth without leaving behind any dangerous cancer cells that could start a new tumor. 可以翻译为：激光光束可以彻底毁灭癌变的组织，不会留下任何可能产生新的癌变的细胞。 ( )

Lasers have also made a big difference in the way telephones work. 可以翻译为：激光在电话的工作方式上有很大的不同。( )

Although many risk-takers see hang gliding as the most dangerous sport of all, Weigel feels hang gliders should not be regarded as thrill seekers.可以翻译为：即便许多冒险者都认为这项运动是所有运动中最危险的，Weigel觉得悬挂式滑翔者不应被看成是寻求刺激的人。 ( )

A scientific discovery is often made long before someone is able to put it to use.可以翻译为：任何科学发现往往都是经过很长的时间才被推广使用。 ( )