n. 守卫者, 警戒, 护卫队, 防护装置vt. 保卫, 看守, 当心vi. 防止, 警惕, 警卫, 看守【化】 护罩【医】 防卫相关词组: go on guard on one's guard off one's guard catch sb off guard on guard

defend/defense/fence/defendant/protect/protection/protective/guard/guarantee
记忆：
1. 词根fend, fens, 含义是“打，击”defend [ di5fend ]　抵抗打击，保护，防卫 It’s our duty to defend our country.保家卫国是我们的责任。
2. defense [ di5fens ] n. 防卫, 防卫设备 n. [律](被告的)答辩、辩护 He works in the defense ministry.他在国防部工作。
3. fence [ fens ] n. 栅栏, 围墙, 剑术 We need to build some fence to keep the wolf off our sheep at night.我们需要修建一些栅栏，以防狼在晚上攻击我们的羊。
4. defendant [ di5fendEnt ] n. 被告 adj. 辩护的 The defendant has the right to explain for himself.被告有权为自己辩护。
5. offend [ E5fend ] of-, ob-, 加强语气；vt. 犯罪, 冒犯, 违反, 得罪 I’m afraid your abrupt words offended him a lot.恐怕你唐突的话冒犯了他。
6. offence [ E5fens ] n. 犯罪, 冒犯, 违反, 罪过 Luckily he didn’t mind your offence. 幸运的是，他对你的冒犯不介意。
7. 词根tect,含义是“遮蔽，掩盖”protect [ prE5tekt ]事先遮盖起来，保护 The law will protect those who are innocent.法律会保护无过错的一方。
8. protection [ prE5tekFEn ] n. 保护 Without protection from modern equipment, I dare say that a human can’t defeat a bear如果没有现代设备的保护，我敢说一个人赢不了一头熊。
9. protective [ prE5tektiv ] adj. 保护性的 We’d better take some protective measures to ensure its safety.我们最好采取一些保护性措施来确保它的安全。
10. guard [ ^B:d ] n. 守卫, 警卫, 防护装置vt.保卫, 看守 Three guards are guarding the house where the diamond is stored.三个警卫看守着存放钻石的房子。
11. guarantee [ 7^ArEn5ti: ] n. 保证, 保证书, 担保, 抵押品 vt.保证, 担保 The rain guarantees a good crop this year. 这场雨保证了今年有好收成
另类阅读：
Steel fences have been set up in defense of the house; guards haven been sent for to defend the room. The defendant is now under complete protection.