You're defending yourself against the horrible parts of yourself and some of these make a little bit of sense.

你通过抵制不适当的原始欲望来保护自己,其中有些防御机制是很有意义的。

耶鲁公开课 - 心理学导论课程节选

His shield, in addition to being a defensive thing, is also potentially an offensive weapon.

他的盾牌,除了能提供防御和保护之外,同样也是一个潜在的有力武器

耶鲁公开课 - 古希腊历史简介课程节选

The hoplite himself is marked by, first of all, the shield and second of all, as we continue to think about his defensive capacities, he has a certain amount of armor to protect his body.

重装步兵的标志,首先就是盾牌,其次,和我们将要说到的防御力有关,就是士兵的身体有一定程度的护甲保护

耶鲁公开课 - 古希腊历史简介课程节选