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。
Aggression is a kind of innate survival mechanism, an instinct for self preservation, that allows animals to defend themselves from threats to their existence.
帮着做家务是他们的天生的本能。
瑞典人在困难时期的天生中间偏左的本能往往脱颖而出。
In hard times Swedes' natural centre-left instincts tend to come to the fore.
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