Black bear cubs use trees for defense, whereas brown bears and polar bears, which regularly inhabit treeless environments, rely on aggression to protect their cubs.

黑熊幼崽用树来防御，而经常生活在没有树的环境中的棕熊和北极熊则依靠攻击性来保护它们的幼崽。

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It's — He had a certain aggression to him.

这里他表现出了一定的攻击性。

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Naked aggression and an attempt to change frontiers by force could not go unchallenged.

对公然侵略和企图用武力改变疆域，人们不会坐视不管。

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Critics pointed out that the agreement does not permit the court to punish aggression by non-member countries or their nationals.

VOA: special.2010.06.21

They're throwing out insults, maybe they're tickling each other, maybe they're making fun of each other, maybe they're making fun of themselves, and there's some aggression to it.

他们会说伤人的话，胳肢别人，取笑对方，取笑自己，而这些打闹是有一定的侵略性的。

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So they like to, sort of, like, get that aggression out elsewhere.

所以他们的精力都用在了其他地方。

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The US has spoken strongly of not allowing North Korea's aggression to go unanswered.

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McIlroy shot a seven-under-par 65 to move to nine under and afterwards revealed he had curbed his natural aggression to work his way into contention.

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Juvonen's study, however, found boys and girls spread rumors to boost their social status -- and that both genders use physical aggression to assert power.

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