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同义 calculate（v. 计算）；reckon（v. 估算）
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converge［kən’və
:rʤ］v. 聚合；集中；结合在一起
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例句 1. The progress in communication technology has converged this world into a real global village. 通信技术的发展使得这个世界聚合成了一个真正的地球村。
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2. In this experiment, all the rays converged at a same point. 在这个实验中，所有的光束都汇聚到了一点。
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3. Small pieces of floating ice converged and formed icebergs. 小块的浮冰聚集在一起，形成了冰山。
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同义 assemble, aggregate（v. 聚合）
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例句 1. Most people think that DIY is cool, but it takes creativity to set the machine up with your own hands. 大多数人觉得自己动手是一件很棒的事情，但是要想自己亲手组装机器，还需要拥有创造力。
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2. The jazz band attracted many fans with the creativity of the lead singer. 这个爵士乐队依靠主唱的创意吸引了许多乐迷。
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decay［di’kei］n./v. 腐烂，腐朽；衰退
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例句 1. Decaying wood is the most suitable habitat for insects such as the spruce bark beetle, which can kill spruce trees if in great numbers. 腐烂的木头是最适合昆虫如云杉树皮甲虫生存的栖息地，当这种虫子数量巨大时便能杀死云杉树。
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2. With the temperature rising, the rest of the organism has started to decay. 随着温度的升高，这个生物体的其余部分已经开始腐烂。
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3. This project is aimed at fighting urban decay. 这一计划旨在对抗城市衰落。
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同义 rot（n./v. 腐烂）；decline（n./v. 衰退）
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deficiency［di’fiʃnsi］n. 不足，缺乏
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搭配 deficiency symptom 营养缺乏症
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例句 1. If all the water is polluted, people will face the deficiency of drinking water. 如果所有的水源都被污染，人们将面临缺乏饮用水的情况。
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2. Vitamin D deficiency will lead to serious diseases, for example bone diseases. 缺乏维生素D会导致严重的疾病，比如骨骼疾病。
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同义 lack（n. 缺乏）
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density［‘densəti］n. 浓度；密度
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例句 1. Exercise helps the bones build density and helps you maintain good health. 锻炼能帮助增强骨骼密度，并让你保持良好的健康状况。
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2. In big cities, since the population density is high, there are always various kinds of social activities, sports events and concerts. 在大城市，由于人口密度大，因此总是会有各种各样的社交活动、体育赛事以及音乐会。
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deposit［di’pɑ
:zit］v. 使沉淀；堆积 n. 堆积物；存款；寄存处，存放处
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例句 1. Excavations of the ancient tomb revealed deposits containing a huge number of pots and other antiques. 挖掘古墓时掘出包含大量罐子以及其他古董的存储间。
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2. It is not difficult to imagine how embarrassed you are if you do not have any deposit. 如果你一点存款都没有，不难想象那将是多么尴尬。
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