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搭配 zero-emission 零排放，无污染
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例句 Although many cities require installing catalytic converters and other controls on motor vehicles to restrict the emission of pollutants, the great number of many thousands of motor vehicles awaiting the installation is also a problem to the government. 尽管许多城市要求在机动车上安装催化转换器以及其他控制装置以减少尾气排放，但等待安装的机动车有数千辆，这一庞大的数目仍然是政府的一个难题。
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enrich［in’riʧ］v. 使充实；使肥沃；使富裕
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例句 1. The decomposition of wood and other plants is a natural process that enriches the soil and makes it more suitable for the future growth of trees. 木材和其他植物的腐烂是一个自然的过程，这个过程会使土壤变得更加肥沃，并且更适合今后树木的种植。
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2. By changing life style constantly, people can enrich their knowledge and broaden their horizon. 通过不断地改变生活方式，人们可以扩充知识并开阔眼界。
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3. Some older people may like classic movies and books that can remind them of the past, and they think these movies and books can enrich people’s spiritual life obviously. 许多年长的人喜欢那些能让他们想起旧时光的经典电影和图书，而且他们认为这些电影和书显然能够充实人们的精神生活。
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同义 fertilize（v. 使肥沃）
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evergreen［‘evərgri
:n］a. 常绿的 n. 常绿树；常绿植物
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搭配 evergreen trees 常青树
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例句 In the 1950s, a kind of evergreen tree which was once very common in this area started to die out. 在20世纪50年代，一种在这个地区曾经十分常见的常青树开始灭绝。
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evolve［i’vɑ
:lv］v. 发展；（使）进化；使逐渐形成
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例句 1. Through their hard work and continuous endeavor, the world evolves more rapidly than ever. 由于他们的辛勤工作和不断的努力，世界正以比以往更快的速度发展。
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2. Some scientists suppose that birds are evolved from dinosaurs. 一些科学家假设鸟类是由恐龙进化而来的。
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3. The techniques of pottery manufacture had evolved to its peak in ancient times. 早在古代，制陶术就已经发展到了极致。
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fluid［‘flu
:id］n. 液体，流体 a. 流动的，液体的
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搭配 fluid dynamics 流体力学
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例句 There’s a kind of fluid with a strong smell on the floor. 地板上有一种气味很重的液体。
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fossil［‘fɑ
:sl］n. 化石；老顽固 a. 陈腐的；化石的
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例句 1. In my opinion, even though a fossil is going to be owned by a private collector, it has to be examined by geologists and zoologists first. 在我看来，就算一块化石将要归一位私人收藏家所有，在此之前也必须先经过地质学家和动物学家的检测。
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2. The scratches found on the fossil of human teeth offered some key clues. 在人类牙齿化石上发现的划痕提供了一些关键线索。
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friction［‘frikʃn］n. 摩擦；摩擦力；矛盾
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例句 1. The forward movement of a small object will be reduced by the air friction. 由于空气摩擦的作用，小物体的向前运动会被减缓。
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2. Sometimes I think the friction between cultures has enriched the world and made it more beautiful. 有时候，我觉得不同文化之间的摩擦丰富了这个世界，也让它变得更加美丽。
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同义 clash, conflict（n. 冲突）
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要点 friction虽然最常用的含义是表示“摩擦力”，但其实这个词也可以表示“冲突”，比如：the friction between（…与…之间的冲突）。
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