Unit 7 The Injection Molding and MachineI. Lead inInformation related to the textDo you know what is called an injection molding machine? Can you give an example of it? What does it work? In this unit you will learn some the Injection Molding and Machine concept, how it is wide application. Now, let's learn new words and phrases.II. Word Study1. inject [in'dʒekt]vt.注射，注入injection n.注射，投资，注射剂1）A sterile applicator is used to inject the microchip just under the skin.一个消过毒的涂药器被注射进微型芯片在表皮之下。
2）Major banks around the world are joining forces to inject as much as 180 billion dollars into global money markets.全世界的主要银行都加入了抵制注入180亿美元到全球的经济市场中的行动。
3）Fire ants get their name because when they sting, they inject poison into the skin that causes a feeling of intense burning. Some people sufferlife-threatening reactions.火蚁因当他们叮住目标时会将一种能导致灼热感的有毒物质注入皮肤而得名。
有些还会有生命危险的反应。
4）There would be no need for injection, since the vaccine would be taken by mouth.通过口服疫苗，我们就不需要注射了。
2. melt [melt] vt. 使软化，使融化，使熔化，使感动1）This element is of proper shape and cross-section to carry rated current continuously and to melt in accordance with a specific time-current characteristic on heavy overload or short circuit.此可熔断元件恰当的形状和横截面使其可连续通过额定电流，而对于严重过负荷或短路，按规定的时间一电流特性而熔断。
2）Either it exposes land, which then warms up; or it forms ponds (or lakes or streams) of meltwater on the surface of the ice, which absorb energy and melt more ice.融冰过程要么导致陆地暴露并且温度升高，要么在冰层表面形成池塘（或湖泊，或溪流），并吸收能量，融化更多的冰。
3）Her money seemed to melt away in Paris.在巴黎她的钱似乎自行消失了。
4）If fast growth and urbanization continue, some overcapacity will melt away.如果高速增长和城市化进程得以持续，部分产能过剩将得到消化。
3. powdered ['paudəd] adj. 粉状的, 变成粉末的,涂粉的1）The ground was lightly powdered with snow.地上薄薄地铺了一层雪。
2）If you combine powdered milk and water, you get liquid milk.把奶粉和水合在一起就成了牛奶。
3）Ceramic elements are made by pressing and sintering finely powdered materials.陶瓷元件是将仔细研磨的材料经过加压和烧结制成。
4）The sweet scented orris root, is the powdered root of the Florentine iris, which was grown in ancient Greek and Roman gardens.有香甜味的鸢尾根是佛罗伦萨鸢尾有许多小斑点的根，这种鸢尾长在古希腊和罗马花园里。
4. hopper ['hɔpə] n.斗；单足跳者；跳虫；漏斗1）Raise hopper feeding inlet size and height.加高投料口尺寸及投料高度。
2）Flexible tube used to convey either powder from hopper to gun or compressed air to gun.把粉末从粉桶输送到喷枪或把压缩空气输送到喷枪的柔性管子。
3）Automatic material loading ty using vacuum blower and material hopper with photo electrical material level sensor.配备电眼料斗与送料风机，能自动上料。
4）When the students left the examination room, they jotted down these questions quickly from memory and put them into the fraternity hopper.学生离开考场后，凭记忆迅速将这些问题写下来，然后存入联谊会的议案箱。
5. screw [skru:] vt.旋，拧；压榨；强迫n..螺丝钉；螺旋vi. 转动，拧1）Can you work the screw loose?你能使这个螺钉松开吗？2）John must have a screw loose to quit such a good job.约翰辞掉这么好的工作，一定是神经不正常。
3）This eyelet is so small that even the smallest screw cannot pass through.这个孔眼太小了，最小的螺丝钉都穿不过去。
4）He is an old screw. You will never be able to make him give out one dollar.他是个老守财奴，你不可能令他交出一元一分。
6. shear [ʃiə] vt. 修剪，剪；剥夺n. 切变；修剪；大剪刀1）In fluids, forces of tension and shear can often be ignored.在流体中，张力和切力通常可以忽略不计。
2）How long does it take to shear a sheep?给一只羊剃毛要花多久时间？3）Because you already are I this life forever are unable to shear the shed worrying.因为你已是我今生永远无法割舍的牵挂。
4）Textbooks commonly denote shear stresses by the symbol and two subscripts.教科书通常用符号和两个脚标表示剪应力。
7. hydraulic [hai'drɔ:lik] adj. 液压的, 水压的, 水力的；水力学的1）The hydraulic shock damper is commonly used to reduce the vehicular vibration.液压减振器一般用来衰减车辆的振动。
2）The paper presents a new structure of honing internal_ hole of hydraulic prop on general lathe.介绍一种在普通车床上珩磨液压支柱内孔的新结构。
3）The Brake system can be divided into two principal parts, hydraulic system and wheel Brake assemblies.制动系统可以分为两个基本部分：液压系统和车轮制动总成。
4）Solenoid valve is a basic component in automatic flow control, it is actuator but not limited to hydraulic, pneumatic.电磁阀是用来控制流体的自动化基础元件，属于执行器；并不限于液压，气动。
8. polymerize ['pɔliməraiz] vt. (使)聚合1）Polymerize together, of two substances.两种物质共同聚合在一起。
2）Of spill or leak: flood with water to polymerize.产品外溅或泄露的措施：用水冲使其聚合。
3）"Polymerize life energy; Cherish being health" is the eternal management idea in the enterprise.“聚合生命能量，呵护人类健康”是我们永恒的经营理念；4）In this paper, polymerization of maleic anhydride which is difficult to polymerize in normal condition was studied by means of microwave radiation.将微波辐射用于一般情况下难以聚合的马来酸酐的聚合，采用家用微波炉进行微波辐射。
III．Language points1. Injection molding is principally used for the production of the thermoplastic parts, although some progress has been made in developing a method for injection molding some thermosetting materials.译文：尽管注塑成型某些热固性塑料的方法取得了一定进步, 但注塑成型主要(还是)用来生产热塑性塑料制件。