defend
用法要点
句型搭配
defend 常用作及物动词，后接宾语表示保护或辩护的对象，也可与介词 against 或 from 连用表示防御的对象。
介词用法
defend 常与介词 against 搭配表示防御某种威胁或攻击，与 from 搭配表示保护免受伤害，在法庭语境中可接 for 表示辩护理由。
语域说明
defend 在正式和非正式语境中均常用，在军事、法律、体育等领域有特定含义，日常对话中多指保护或辩护行为。
基础例句
He defended his friend when others were criticizing him unfairly.
当别人不公平地批评他朋友时，他为他辩护。
The soldiers defended the castle from the enemy attack.
士兵们保卫城堡免受敌人攻击。
She always defends her children when they make mistakes.
她的孩子犯错时，她总是为他们辩护。
I need to defend my decision to change jobs.
我需要为我换工作的决定辩护。
高级例句
The lawyer will defend the client in the high-profile court case next week.
律师将在下周的高调法庭案件中为当事人辩护。
The company must defend its market position against emerging competitors.
公司必须防御新兴竞争对手，以维护其市场地位。
Researchers defended their hypothesis with substantial experimental data.
研究人员用大量实验数据为他们的假设辩护。
The government issued a statement to defend its foreign policy decisions.
政府发表声明为其外交政策决定辩护。
高频搭配
verb
adjective
noun
adverb
preposition
phrase
常见错误
defend 作为及物动词时通常需要宾语，表示保护的对象；这里应加上反身代词 oneself 或具体宾语，并用 against 表示防御的对象。
这个用法本身正确，但中文学习者常误用 defend 表示“解释”而非“辩护”；defend 强调在受到挑战或批评时的保护行为，而 explain 更中性。例如：She explained her opinion (解释) vs. She defended her opinion when challenged (辩护)。
近义词辨析
protect
protect 强调采取预防措施以避免伤害或危险，通常更被动或预防性；defend 则更主动，涉及抵抗攻击或辩护，常用于受到实际威胁时。
We protect the environment by reducing pollution. (预防性保护) vs. The army defended the border from invasion. (主动防御攻击)
justify
justify 侧重于提供理由或证据来证明某事合理或正确，常用于解释行为或决定；defend 更强调在受到批评或攻击时为某人或某事辩护，带有保护性。
He justified his absence with a doctor's note. (提供理由证明合理) vs. She defended her friend's actions in the meeting. (在批评中辩护)