DK 全球视觉系列 one million things science 一百万件事科学系列

FULL OF LIFE
充满活力
A coral reef is packed with marine life. Different species of fish, crustaceans, marine plants, and mammals, as well as billions of microscopic plankton, make the waters around a coral reef their home
珊瑚礁充满了海洋生物。不同种类的鱼类、甲壳类动物、海洋植物和哺乳动物，以及数以亿计的微型浮游生物，使珊瑚礁周围的水域成为它们的家园

LIFE ON EARTH Life exists in rich abundance on Earth. A species is a group of living organisms, such as humans, golden eagles, and blue whales, which share common characteristics and can breed with each other.
地球上的生命地球上的生命丰富多彩。一个物种是一组有生命的有机体，例如人类、金雕和蓝鲸，它们有共同的特征，可以相互繁殖。
Scientists have identified almost two million different species, although there may be many more. These are divided up into five kingdoms—plants, animals, fungi, bacteria, and single-celled organisms known as protists. All share some basic characteristics of life that enable them to survive.
科学家们已经确认了将近两百万种不同的物种，尽管可能还有更多。它们被分为五个王国植物，动物，真菌，细菌和单细胞有机体称为原生生物。它们都有一些基本的生命特征使它们得以生存。

RESPONSIVENESS All living things have an awareness of their surroundings and are able to respond to their environment. An animal may respond to sound, heat, or light with specially adapted nerve cells sending signals from one part of the body to another.
所有生物都有对周围环境的感知，并能对周围环境做出反应。动物对声音、热或光作出反应时，会有特别适应的神经细胞从身体的一个部位向另一个部位发送信号。
Plants are sensitive to gravity with stems growing upward and roots growing downward. They also respond to light by bending toward light sources. This is known as phototropism.
植物对重力很敏感，茎向上生长，根向下生长。它们也通过向光源弯曲来对光作出反应。这就是所谓的向光性。

PLANT STRUCTURE
植物结构
There are more than 300,000 species of plants, ranging in size from the minute species of Wolffia (members of the duckweed family) to giant sequoia trees, the largest of which stand more than 330 ft (100 m) high.
有超过30万种植物，大小不等，从小种的狼尾草（浮萍科成员）到巨型红杉，其中最大的高达330英尺（100米）。
Botanists divide plants into those that produce flowers and those that are nonflowering. Along with some bacteria, plants are the only living things that manufacture their own food through photosynthesis.
植物学家把植物分为开花植物和不开花植物。除了一些细菌外，植物是唯一通过光合作用制造自己食物的生物。

CONVERTING SUNLIGHT
光合作用
Photosynthesis is the process in which energy from sunlight is used to convert carbon dioxide and water into glucose and oxygen.
光合作用是利用阳光的能量将二氧化碳和水转化为葡萄糖和氧气的过程。
Chlorophyll in a plant’s leaves absorbs energy from sunlight. The energy-rich glucose is transported around the plant as food, but can also be used to form more complex chemical substances. These include cellulose, which is used to build the walls of plant cells.
植物叶片中的叶绿素从阳光中吸收能量。能量丰富的葡萄糖作为食物在植物周围运输，但也可以用来形成更复杂的化学物质。其中包括用于构建植物细胞壁的纤维素。

REPTILES AND AMPHIBIANS
爬行动物和两栖动物
Reptiles are land-dwelling creatures with tough skins covered with scales. All reptiles are vertebrates (they have backbones) and most have four legs, although snakes and worm lizards do not.
爬行动物是居住在陆地上的生物，坚韧的皮肤上覆盖着鳞片。所有的爬行动物都是脊椎动物（它们有脊椎），大多数有四条腿，尽管蛇和蠕虫蜥蜴没有。
For about 200 million years, giant reptiles called dinosaurs were the world’s largest creatures. Amphibians were the first vertebrates to move from water to land.
在大约2亿年的时间里，被称为恐龙的巨型爬行动物是世界上最大的生物。两栖动物是最早从水上迁徙到陆地的脊椎动物。

ECOSYSTEMS
生态系统
Ecosystems are complete communities of different living things, together with their environment including the climate. An ecosystem can be as small as a pond or a single rotting tree stump, or as large as a tropical rain forest.
生态系统是不同生物及其环境（包括气候）的完整群落。一个生态系统可以小到一个池塘或一个腐烂的树桩，也可以大到热带雨林。
Ecosystems are treated as separate units since this makes them easier to chart and study. In reality, they are rarely closed systems, and food and energy may flow from one ecosystem to another.
生态系统被视为独立的单元，因为这使它们更容易绘制和研究。实际上，它们很少是封闭系统，食物和能量可能从一个生态系统流向另一个生态系统。

HUMAN BODY
人体
The human body’s building blocks are some 100 trillion cells. Many of these microscopic units are grouped together to form tissues. An organ, which performs one or more key functions,
人体的组成部分是大约100万亿个细胞。许多这些微观单位组合在一起形成组织。执行一个或多个关键功能的器官，
consists of two or more types of tissues and often works along with other cells, tissues, and organs in a system. The human body relies on 12 major systems, including the lymphatic system and the circulatory system.
由两种或两种以上的组织组成，通常与系统中的其他细胞、组织和器官一起工作。人体依赖12个主要系统，包括淋巴系统和循环系统。

本资源包含内容：【DK  one million things science】高清pdf

悠悠乐英语资源站主要有国家地理英文原版教材，以及英文National Geographic原版练习册，DK原版书籍，以及剑桥牛津的教材和大量英文原版杂志，还有供少儿英文阅读的桥梁书early chapter book，提高少儿英文阅读水平，为您的英语学习服务