一个攻击生物在战斗阶段中的“宣告阻挡者步骤”中，如果没有生物阻挡它，它便成为一个未受阻挡的生物。

An attacking creature becomes an unblocked creature during the declare blockers step of the combat phase if no creature blocks it.

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这些细胞可以直接攻击并杀死微生物。

These are the cells that directly attack and kill microorganisms.

《柯林斯英汉双解大词典》

社会生物学是生物学方法的一个分支；据社会生物学理论表明，攻击性是与生俱来的，甚至是人类所希望得到的。

An offshoot of the biological approach called sociobiology suggests that aggression is natural and even desirable for people.

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