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3. Some students have been selected as representatives to plan the graduation ceremonies. 一些学生被选为代表来筹划毕业典礼。
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同义 typical（a. 典型的）
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restrict［ri’strikt］v. 限制，约束
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例句 1. Education was restricted to certain areas of the society and not everyone can benefit from its advantages. 教育被局限于社会特定的部分，而且并不是每个人都可以从中获益。
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2. Although many cities require the installation of catalytic converters on motor vehicles to restrict the emission of pollutants, the concentration of millions of motor vehicles in big cities is still a problem. 尽管许多城市都要求机动车辆安装催化转换器来限制污染物的排放，但是大城市里为数众多的机动车辆集中在一起仍然是个问题。
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3. Parents who restrict their children’s activities will be blamed. 限制其子女活动的父母会受到指责。
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同义 limit（v. 限制）；restrain（v. 抑制）
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要点 restrict和restrain的含义比较容易混淆，在使用时要注意区分：restrict主要表示“限制”，而restrain则更侧重“抑制；监禁”等含义。
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restriction［ri’strikʃn］n. 限制，约束
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例句 Suppose that if everyone can go to college without any restrictions, the campus will be too crowded, and there will be less space in the library for students. 想象一下，如果没有限制，人人都可以上大学，那么校园将变得拥挤，图书馆里供学生们学习的空间也会变少。
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reward［ri’wɔ
:rd］n. 报答，报酬；奖赏 v. 奖赏，奖励；酬谢
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例句 1. Employees who achieve this goal will be rewarded. 达到这个目标的员工将受到奖励。
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2. I took part in the competition with no expectation of being rewarded. 我参加这个比赛时没有期待得到奖赏。
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同义 prize（n. 奖赏）
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rewarding［ri’wɔ
:rdiŋ］a. 有益的；值得做的；令人满意的
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例句 Science and math are intellectually rewarding as they teach the knowledge that improves living standards. 科学和数学对我们的智力有益，因为它们教授的都是能提高人们生活水平的知识。
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separate［‘seprət］a. 分离的；个别的［‘sepreit］v. 分离；划分；区别
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搭配 separate school 男女分校
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例句 1. The world is no longer a separate one where each part is independent. 世界已不再是独立、分离的个体了。
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2. Threshing machines to separate the seeds from the plants were widely used. 把种子与植株分离的脱粒机得到了广泛应用。
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同义 split（v. 分开）
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派生 separately（ad. 分别地；分离地）
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要点 表示“区分”时，还可以用短语sort out，但separate主要表示“分开”，而sort out则含“分类”的意思。
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sharpen［‘ʃɑ
:rpən］v. 削尖，磨快；使敏锐；使清晰
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例句 1. Most people are interested in how to sharpen memory and recall more information. 许多人都对如何提高记忆力并回忆起更多信息感兴趣。
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