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acquire， achieve， attain acquire： （经过努力）获得（知识、信息等）。如：
1. She has acquired a good command of English.
2. Gradually they acquired experience in how to guide the work. achieve： 实现目标，取得成功，着重在达到一定目的过程中所包含的技能和努力。如：
1. These are the major successes they have achieved in the past ten years.
2. He will never achieve anything if he doesn't work hareder. attain： 达到（目的等），取得（成就等），一种比较庄重点说法，常用于一般人能力不易达到的目的。如：
1. They are seeking(寻找，探索，寻求) to attain the most advanced technological(科技的) level in the world.
2. They both attained success.
aid，assist，help
aid： vt；n. 帮助（比较正式用语）。如：
1. I aid him in his task（n. 任务，作业 v. 分派人物）.
2. Without your aid, I couldn't have succeeded.
3. A dictionary is an important aid in learning a new language.
assist： vt. 帮助（有协助之意）。 如：
1. She assisted the hostess at the party.
2. Good glasses will assist you to read.
help： vt；n. 帮助（一般用语）。 如：
1. We should help each other and learn from each other.
arise，rise，raise，arouse
arise： vi. 发生，产生，出现，由...而引起。强调因果关系，后接介词from或out of,表示问题，事故，困难等出现代原因。 如：
1. Difficulty will arise as we do the work.
2. The question then arises as to what we are going to do next.
rise： vi；n. 上升，起来。 如：
1. The sun rises in the east and sets in the west.
2. He fell,but he soon rose to his feet.
raise： vt. 提高，举起，提出。 如：
1. She raised her finger to her lips as a sign for silence.
2. There is an important point I want to raise.
arouse： vt. 引起，激起，唤起；唤醒。 如：
1. This announcement will arouse a feeling of anger among freedom-loving people.（这一宣告将会激起爱好自由人们的愤怒。）
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