美国科学60秒 SSS 2013-02-01
时间：2019-01-20 作者：英语课 分类：Scientific American(二)月
Beneath its adorable exterior 1 is your cat hiding the heart of killer 2.Researchers now estimated that each year domestic cats kill billions of birds and mammals in the United States alone.The report is in Nature Communications.We already knew that domestic cats can wreak 3 havoc 4 on islands causing 14 percent species extinctions and ranking as one of the worlds 100 worst invasive species.But now scientists have reviewed previous study to find just how much damage cats do on the mainland.Cats kill some 1.4 to 3.7 billion birds and 6.9 to 20.7 billion small mammals in the US each year.This numbers mean that felids may be the biggest human related cause of death for American birds and mammals.And cats had prong need of species which can cause major ecosystem 5 damage.The worse feline 6 killer and those without owners and reducing feral cat populations is a ongoing 7 problem.But you can still reduce the impact of domestic cats by keeping your pet indoors.Thus leaving the neighborhood a little less red in tooth and claw.
- The seed has a hard exterior covering.这种子外壳很硬。
- We are painting the exterior wall of the house.我们正在给房子的外墙涂漆。
- Heart attacks have become Britain's No.1 killer disease.心脏病已成为英国的头号致命疾病。
- The bulk of the evidence points to him as her killer.大量证据证明是他杀死她的。
- She had a burning desire to wreak revenge.她复仇心切。
- Timid people always wreak their peevishness on the gentle.怯懦的人总是把满腹牢骚向温和的人发泄。
- The earthquake wreaked havoc on the city.地震对这个城市造成了大破坏。
- This concentration of airborne firepower wrought havoc with the enemy forces.这次机载火力的集中攻击给敌军造成很大破坏。
- This destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
- We all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
- As a result,humans have learned to respect feline independence.结果是人们已经学会尊重猫的独立性。
- The awakening was almost feline in its stealthiness.这种醒觉，简直和猫的脚步一样地轻悄。