[简答题]
{{B}}Section A{{/B}}
Translate the underlined sentences of the following passage into Chinese. Remember to write the answers on the answer sheet.

While military scientists test lasers against satellites, surgeons use them as miraculously accurate scalpels(外科用小刀). They can even be used to detonate hydrogen bombs. (81) {{U}}The beam can be focused to spot one fiftieth the size of a human hair, yet its intensity is enough to kill cancer cells or drill through the most delicate bones.{{/U}}
More than a decade ago, eye surgeons realized that they could use laser’s beam to seal individually, the microscopic blood vessels in the retina (视网膜). The beam is so fine that only the target is heated. Now its pinpoint blasting power has been turned to destroying cancer cells and reducing birthmarks. For cancer treatment, the diseased cells must be killed while their healthy neighbors are left unharmed. (82) {{U}}Where the cancer can be

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