| 1. | “ in nightmarish proportions , a common bedbug appears poised for a blood meal , compliments of a human host
就像是场恶梦，一只普通的臭虫正蓄势待发，准备从人类身上饱尝血液大餐。 |
| 2. | In return , their human hosts proide them with a warm place to lie and a share of their meals
它们为人类作了这么多，反过来人类为它们提供一个温暖的住所并将食物中的一部分分享给它们。 |
| 3. | In return , their human hosts provide them with a warm place to live and a share of their meals
它们为人类作了这么多，反过来人类为它们提供一个温暖的住所并将食物中的一部分分享给它们。 |
| 4. | By comparing influenza viruses found in birds with those of the avian virus that have also infected human hosts , researchers have identified key genetic changes required for pandemic strains of bird flu
研究者对鸟类和人类中禽流感病毒比较，鉴定出禽流感菌株作出的关键基因改变。 |
| 5. | The networks that support everyday life and provide employment , transportation infrastructure , necessities and luxuries are the same ones that infectious diseases exploit to spread among human hosts
日常生活中的复杂网络，包括工作场合、交通设施、生活所需与休?享乐等各个环节，也正是传染病原在人群中散播的管道。 |
| 6. | These bacteria are symbiotic with their human hosts ? drawing sustenance from them , but also giving something in return by performing chemical transformations that human cells cannot manage and safely occupying ecological niches that might otherwise be colonised by pathogens
这些细菌与它们的人类宿主处于一种共生的关系? ?尽管像那个宿主那里获取营养物质，但反过来能帮助人体实现身体细胞不能做到的化学反应或是防止病原菌侵入人体而保持生态上的平衡。 |
| 7. | Its leap - if not dodged - is not precisely fatal to its prey , for once the headcrab has attached itself to the skull of a human host , there commences a swift and horrible process of & quot; zombification & quot; which gives the host a continued existence of the most objectionable sort
它们的跳跃?如果没有遭到闪避?是不会确实地摧毁其猎物，只要头蟹附上一个人类宿主的脑袋，就会着手于一个快捷且可怕的程序“僵尸化” ，使宿主以一个极不愉快的方式继续生存。 |
