Aggression is a kind of innate survival mechanism, an instinct for self preservation, that allows animals to defend themselves from threats to their existence.
攻击性是一种天生的生存机制，一种自我保护的本能，使动物能够保护自己不受生存威胁。
The researchers explained that the study demonstrated when we are in a novel environment the brain partly remains alert so that humans can defend themselves against any potential danger.
研究人员解释说，这项研究表明当我们处于新环境，大脑会保持部分警觉，这样人类就能在各种潜在的危险中保护自己。
All our officers are trained to defend themselves against knife attacks.
我们所有的警察都接受过自卫训练，能够对付持刀袭击。
They find it hard to defend themselves.
他们发现很难为自己辩护。
Finally they took up arms to defend themselves.
他们最后终于拿起武器进行自卫。
Ants defend themselves by biting or by stinging.
蚂蚁通过咬和刺来保护自己。
America's priority is to help nations defend themselves.
美国最优先考虑的是帮助各国自卫防御。
They use weapons as us to defend themselves from danger.
它们象我们一样使用武器保护自己脱离危险。
The law allows people to defend themselves against a charge.
该法允许人们抵御指控自己。
Many of the indigenous plants aggressively defend themselves.
很多本土植物为保护自己而有攻击性。
She teaches them to fish, forage, hunt, and defend themselves.
她教他们捕鱼，搜寻粮草，追捕，和防卫它们自己。
It is a fixed rule with the wise never to defend themselves with the pen.
智者不会用笔来为自己辩解，这已是永恒的法则。
But plants can defend themselves by using both physical and chemical means.
但植物也能用物理和化学方法来保护自己。
European countries spend quite enough to defend themselves — against real threats.
欧洲国家在保卫自己的利益，防卫真正的威胁方面倒是下了大功夫。
The crabs defend themselves by carrying tiny stinging sea anemones in their claws.
螃蟹进行辩护，在他们的小爪子海葵刺痛自己。
Animals use their claws or talons to catch prey, climb trees, and defend themselves.
动物使用爪子来捕获猎物，攀爬树木和自我防御。
They become fair game by virtue of their ubiquity, or inability to defend themselves.
因为容易曝光又无法为自己辩护，而成为大众游戏的主角。
"Business owners deserve a forum where they are able to defend themselves," she says.
“企业主应该有一个论坛，让他们能够保护自己，”她说。
They're often unable to deal with aggressiveness and hardly learn to defend themselves.
他们常常不会处理外界对他们的侵犯，很难学会保护自己。
At least that's the scheme some plants have developed to defend themselves from leaf eaters.
至少一些植物就采用了这个计划来保护自身免于食草动物的伤害。
Holiness is in right action and courage on behalf of those who cannot defend themselves.
神圣只存在于正确的举动以及那些无法自保的人所体现出来的勇气。
Aircraft carriers and their accompanying ships are unable to defend themselves against such a threat.
航母和随行船只无法在这样的威胁下保护自己。
Though one may be overpowered, two can defend themselves. A cord of three strands is not quickly broken.
有人攻胜孤身一人，若有二人便能敌挡他。三股合成的绳子，不易折断。
The bill would infringe upon the ability of law-abiding citizens to defend themselves and their families.
这项法案会限制守法公民自卫和保护家人的能力。
They must also hire lawyers to defend themselves against attacks by other lawyers on a playing field built by lawyers.
它们还要在受到其他律师攻击时聘请律师为自己辩护，而这唇枪舌战的比赛场地依然是律师们自己搭建的。
All pangolins can roll themselves into a ball to defend themselves. The cutting action of their scales protects them too.
所有穿山甲都能够把身体卷成球状来保护自己，锋利的鳞甲也是保护它们的工具。
All pangolins can roll themselves into a ball to defend themselves. The cutting action of their scales protects them too.
所有穿山甲都能够把身体卷成球状来保护自己，锋利的鳞甲也是保护它们的工具。
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