debate vt. 讨论，争论 n. 争论，辩论
[特征]
- he debated with his father about the question.
他和父亲就这个问题展开了辩论。
- after much debate he was chosen monitor of the class.
经过广泛的讨论，他被选为班长。
[备考必背] 重要词组
be under debate 在讨论中
- the new rules are under debate.
新规则正在讨论中。
declare vt. 宣布；断言
[特征]
declare是一个正式用语，意思是“正式告知或通过官方使……为人所知”，即“宣布”；还指强调性地或权威式地“宣称，断言”。总之，declare含有经过考虑或通过一定程序后正式让别人知晓的意思。
- the prime minister declared his intention in his speech.
首相在讲话中声明了他的意图。
- he declared at the meeting that he supported me.
他在会上声明他支持我。
[备考必背]
①declare作“宣布”讲，含有“庄严”的意味，所以常接that从句作宾语。
- the arab people declared that they would fight to the finish.
阿拉伯人民宣布，他们要战斗到底。
② declare不能接不定式短语作宾语。
deep adj. 深的；深厚的；来自深处的 adv. 深深地
[特征]
- the river is six feet deep.
河水深6英尺。
- the boy read deep into the night.
这男孩读书一直到深夜。
[贴心叮咛]
deep既可以作形容词，也可作副词。它和deeply的辨析很重要。
[备考必背]
①deep既可以作表语，也可以作定语，如：
a deep sleep 沉睡 a deep voice 低沉的声音
②辨析副词deep和deeply
deep用于具体的深度，包括空间和时间，它不能修饰形容词和分词；deeply用于抽象、比喻意义，与表达情感的动词、形容词或过去分词连用时，常用deeply。
[练习与解答]
- he is interested in english. he often works at it until into the night.
a. deep; deeply b. deep; deep c. deeply; deep d. deeply; deeply
答案：c
（他对英语非常感兴趣。他经常学习英语到深夜。如果你仔细阅读了上面关于deep和deeply的辨析就很清楚为什么选c了。）
defeat vt. 击败，战胜；使破灭
[特征]
defeat是及物动词，可以直接跟宾语：defeat sb.（击败某人）。
- they defeated us in the game.
他们在比赛中赢了我们。
- the old granny's hopes were defeated.
老奶奶的希望破灭了。
[贴心叮咛]
英文中有几个单词都有“战胜，击败”的意思，但含义不同，要注意defeat，beat和conguer的区别。
[备考必背] 辨析defeat，beat和conguer
defeat的含义是“打败”，但被打败者不一定服输；beat则表示彻底“打败”，而且被打败者完全服输了；conguer更强调“把对方征服”，而且被征服者或被征服者的国家为征服者所有，可以任意支配。
- the public bet a lot of money on tom, but he was defeated.
人们为汤姆下了一大笔赌注，但是他被击败了。
- it was not until his third match that he finally beat humphries.
直到他的第三次比赛，他才最终打败汉弗莱斯。
- some countries may be defeated but can never be conguered.
有些国家可能被打败，但决不会被征服。