The village is defenceless against attack.
这个村庄毫无防御能力。
After decades without infection, most of theworld's wheat crop was defenceless.
由于已经几十年没有感染真菌，世界上大部分的小麦作物都变得不堪一击。
The mass use of Tamiflu could leave Britain all but defenceless against swine flu, doctors have warned.
医生们发出警告：大规模使用达菲可能会让英国几乎对甲型H1N1流感没有抵御能力。
Without my team and the vital equipment they were pulling along in their sledges I was completely defenceless against the fatally low temperatures of Antarctica.
没有我的队友，没有她们雪橇中带着的必要物资，我在南极的极低气温中是完全没有抵御能力的。
Although seemingly defenceless, it is capable of simply flinging itself from its perch, curling up into a ball and bouncing off boulders and down steep slopes to safety.
虽然看上去无法自卫，它却可以从栖息的高位简单的将自己投掷出去，卷成一团在大卵石之间弹来弹去滚下险峻的斜坡抵达安全地带。
The ants devour the defenceless larvae.
蚂蚁吞食不能自卫的幼虫。
This attack on a defenceless elderly person is an act of pure cowardice.
攻击手无寸铁的老人完全是一种怯懦行为。
Scientists have found that viruses may sometimes remain inactive FOR years, but can quickly infect any defenceless cell.
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。
As soon as I remembered I was not defenceless, courage glowed again in my heart and I set my face resolutely for this man of the island and walked briskly towards him.
一想到我并非毫无抵抗能力，我心中又重新生出了勇气，于是我决心面对这个岛上的人，迈着轻快的步子向他走去。
Once impregnable, they are now defenceless against the thousands of tourists who swarm here each year to relax on the plethora of beaches and marvel at the imposing fortresses.
这些城堡曾经坚不可摧，如今却对每年来到这里的成千上万的游客敞开了大门。游客们在这里众多的海滩上尽情放松自己，他们对这些宏伟的城堡赞叹不已。
Once impregnable, they are now defenceless against the thousands of tourists who swarm here each year to relax on the plethora of beaches and marvel at the imposing fortresses.
这些城堡曾经坚不可摧，如今却对每年来到这里的成千上万的游客敞开了大门。游客们在这里众多的海滩上尽情放松自己，他们对这些宏伟的城堡赞叹不已。
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