要观察到更多种鸟儿，你可能需要长途跋涉，走过崎岖不平的难走的地势，还要背负装着观鸟指南、双筒望远镜、单筒望远镜和其他器材的野营包。
Observing many different species of birds may require long hikes and walks over uneven and challenging terrain while carrying a field bag with guides, binoculars, scopes and other equipment.
我也走这边“,的语调有点阴沉，Enoch，said，in，a，sullen，voice。,路的左边是家电影院,里面正在换电费单。
I'm going thisaway too," Enoch On the left there was a movie house where the electric bill was being changed.
想一想加利福尼亚州圣塔莫尼卡市的Denny Fongheiser，他在52岁的时候，原来每天走3英里的路毫不费力，可是现在走完后却气喘吁吁，但他加入的保险公司不会为他的压力检测埋单，就因为他的胆固醇数值是正常的。
Consider Denny Fongheiser of Santa Monica, Calif. At 52, his usual 3-mile-a-day walk suddenly left him panting, but his insurer wouldn't pay for a stress test because his cholesterol was normal.
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