Forms of Life
生存的形式
Mammals are covered by hair or fur, have a backbone and are warm-blooded.哺乳动物被毛或毛皮覆盖，有脊椎骨，是温血动物。
All female mammals produce milk for their young.所有雌性哺乳动物都为幼崽产奶。
Reptiles are covered by scales and include snakes,lizards and turtles. 爬行动物被鳞片覆盖，包括蛇、蜥蜴和乌龟。
Reptiles have a backbone and are cold-blooded, which means they often rely on external sources of heat.爬行动物有脊椎骨，是冷血动物，这意味着它们经常依赖外部热源。
Birds are covered by feathers and are warm-blooded.鸟类被羽毛覆盖，是温血动物。
Most birds can fly and many types of birds migrate great distances. 大多数鸟会飞，许多种类的鸟迁徙距离很远。
Most insects such as ants and bees have a small, 3-part body with 3-pairs of legs.大多数昆虫，如蚂蚁和蜜蜂，都有一个由三部分组成的小身体和三对腿。
Some insects, like mosquitoes, spread diseases that cause the deaths of many humans.有些昆虫，如蚊子，传播导致许多人死亡的疾病。
Unlike animals, plants get the energy that they need from the sun. 与动物不同，植物从太阳中获得它们所需要的能量。
Plants convert light energy, along with carbon-dioxide and water, into chemical energy.植物将光能、二氧化碳和水转化为化学能。
Instruments工具（器械）
Scales and rulers are used to measure weight and length.天平和尺子是用来测量重量和长度的。
Units of weight include kilograms and pounds, and units of length include centimeters and inches.重量的单位包括千克和磅，长度的单位包括厘米和英寸。
These instruments are used to observe very large and very small objects. 这些仪器用于观察非常大和非常小的物体。
Telescopes are used by astronomers, and microscopes are used by biologists and doctors.天文学家使用望远镜，生物学家和医生使用显微镜。
These appliances are used in the kitchens of almost every home. 几乎每个家庭的厨房都使用这些电器。
Stoves are used to heat food and refrigerators are used to keep foods cool or cold.炉子用来加热食物，冰箱用来冷藏食物。
Household tools like these are used to build and repair things. 像这样的家用工具是用来建造和修理东西的。
Hammers are used to pound in nails and screwdrivers are used to turn as crew.锤子用来敲钉子，螺丝刀用来拧螺丝。
