匪徒袭击无防御的村庄。
匪徒袭击无防御的村庄。
匪徒突袭无防御的村庄。
科学家发现病毒有时可处于不活跃状态达数年时间，但是能突然感染任何无防御的细胞。
Scientists have found that viruses may sometimes remain inactive FOR years, but can quickly infect any defenceless cell.
这些诉讼风险增加了开始，迫使医生们在进行无必要的检测时进行[font=宋体]“防御式医疗”。
The risk of being sued pushes up costs, obliging doctors topractice “defensive medicine” in the shape of needless tests and procedures.[/align]
格兰特将军开始学习到战争中一门重要的课程：防御战术的进步已经远无大于进攻战术的进步。
General Grant was beginning to learn an important lesson of the war. The methods of defense had improved much more than the methods of attack.
这种防御机制已经为人所熟识了，而且在其他一些无脊椎动物中也有发现。但是目前还没有报道说明是什么使得它们形成这样的机制，也不知道这是否可以有效地反抗捕食者。
This is a recognised defence mechanism and has been mentioned in other invertebrates, but no one had published on what exactly makes them do it or whether it actually is effective against predators.
知识的缺失导致行动无据，过度防御行为使得本原风险出现叠加效应。
Knowledge absence leads to irrational action while excessive defensive action brings about the spliceable effect of the prime risk.
完整无破损的皮肤是防御HIV最好的屏障。
Integrity of the damaged skin is the best defense HIV barriers.
交河城的布局和构筑方式，在中外城市建筑史上独一无二，军事防御是交河城构筑特色形成的基本原因。
The structural method of Jiaohe city is unique in the history of city's development both in China and abroad as the purpose of its layout is solely for military defense.
交河城的布局和构筑方式，在中外城市建筑史上独一无二，军事防御是交河城构筑特色形成的基本原因。
The structural method of Jiaohe city is unique in the history of city's development both in China and abroad as the purpose of its layout is solely for military defense.
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