Lost in the Woods?

• 来源期刊: 中学科技
• 年，卷（期）: 2016,（8）
• 所属期刊栏目: 科普英语
• 页码范围: 31
• 页数: 1页
• 语种: 中文

摘要

In the United States alone,as many as 34 million hikers hit the trails each year.Some of those hikers invariably get lost.To find them,a small army of (A) (r) may scour the woods in search of the missing by foot-and sometimes from the air.Scientists in Switzerland thought these rescue efforts might be better handled by a drone,an (B) (a) that flies without a pilot on board.Most are remote-controlled.But this Swiss team wanted to develop a craft that could find and search trails without anyone at the controls.