The giant water bugs are known to only attack moving prey so it is likely that the 58mm insect captured and killed the young turtle before feeding on it.
我们知道巨型水蝽只攻击移动的猎物，所以这只58毫米长的昆虫可能是先抓住并杀死这只幼小的金线龟后才开始食用它。
Sea lions can be very territorial, but usually only attack humans when provoked.
海狮虽然很重视自己的领地，但是通常它不会攻击人类，除非人类先去挑衅它。
Sharks only attack when they are hungry or aggravated.
鲨鱼只是在牠们饥饿或者被惹怒的时候才发动攻击。
He said weasels only attack chickens and other domestic fowl when they are starving and no other food source can be found.
他表示，只有在饿得不行而又找不到其他食物的时候，黄鼠狼才会袭击鸡和其他家禽。
The analysis indicates that the encryption algorithm not only can effectively resist cipher-text-only attack but also chosen-plaintext attack.
分析表明，该文所设计的加密算法不但能抵抗唯密文攻击，而且能有效地抵抗选择明文攻击。
Under the assumption that the random high-density knapsack problem is infeasible, the proposed schemes are provably secure against ciphertext-only attack.
在高密度随机背包困难性假设下，可以证明方案在唯密文攻击下是安全的。
Under the assumption that the random high-density knapsack problem is infeasible, the proposed schemes are provably secure against ciphertext-only attack.
在高密度随机背包困难性假设下，可以证明方案在唯密文攻击下是安全的。
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