上回说到气场无比强大的APS老师已经开始追问你自己挖的坑-工程材料的问题了，那么我们该如何应对呢？
with萌萌的眼神建议大家来一句：
so...Engineering materials may be further subdivided into: ①Metal ②Ceramics ③Composite ④Polymers, something like that
我个人很喜欢用may be，和我们广大低调奢华有气质的留德华很配哦。
虽然语言简单，但几个专业词汇很重要：
①金属材料②陶瓷材料③复合材料 ④聚合材料
提到金属了！这可是有60%的几率会被问及Metals and Metal Alloys，就算没被问到也可以先发制人：
Metals are elements that generally have good electrical and thermal conductivity. Many metals have high strength, high stiffness, and have good ductility.
有没有被自己帅到？一般来讲比较傲娇的审核官会问你具体是哪些金属，你顺坡爬就可以了，但也有一些奇葩的问你什么是superconductors，哪些金属可以转化为这个，如何转化。
我一个学生目前还比较满意的答案是：Some metals, such as iron, cobalt and nickel, are magnetic. At low temperatures, some metals and intermetallic compounds become superconductors.
说白了，只要有“在极低的温度下，某些金属和金属化合物能转变成超导体。”这句就成了，至于是例如铁、钴还是镍，您任选吧。
What is the difference between an alloy and a pure metal?
这么没水平的问题也是会有的，我这边一个同样水平不高但还能过的去的参考答案是：
Pure metals are elements which come from a particular area of the periodic table. Examples of pure metals include copper in electrical wires and aluminum in cooking foil and beverage cans.（神呀！原谅我的英语吧！）
