213. clue n. 线索，提示 

(例)The police found a clue which will help them catch the robber.警察发现了能帮助他们抓住强盗的线索。

214. collision n. 碰撞，冲突 

(例)a collision between two trains一次两列火车相撞事件 in collision with和... 相撞［冲突］

215. device n. 装置，设备 

(例)These newly-designed devices will appear on the exhibition next month.这些新设计的器件将在下月的展览会上展出。
216. devise vt. 发明，策划，想出 

(例)The Inquisition of the Medieval Ages devised many demoniac means of torture.中世纪的宗教法庭创造了许多骇人听闻的酷刑。
217. inevitable a. 不可避免的 

(例)Such a difficult operation may not succeed, it's an inevitable gamble.这样难度很大的手术可能不成功,但这是一次非做不可的冒险。
218. naval a. 海军的 

(例)The naval port is silent and beautiful at night.军港之夜寂静而美丽。

219. navigation n. 航行 

(例)Navigation Acts航海条例
220. necessity n. 必需品；必要性 

(例)Food and clothing are necessities of life.食物和衣服都是生活的必需品。

221. previous a. 先，前，以前的  (例)He has had no previous experience of this kind of job.他从前没有做这种工作的经验。

222. provision n. [pl.]给养，口粮 

(例)Provisions are plentiful.粮食充足；设备，装置；准备  (例)They make provision against possible disasters.他们采取措施防备可能发生的灾难。
223. pursue vt. 追逐 ，追求，从事，进行

(例)The police are pursuing an escaped prisoner.警方正在追捕一个在逃的犯人；

(例)People can not live only to pursue pleasure.人不能只为寻乐而活着；

(例)She pursued the study of English for five years.她持续不断地学了五年英语。

224. stale a. 不新鲜的，陈腐的 

(例)stale bread不新鲜的面包，stale news陈旧的新闻
225. substitute n. 代用品  vt. 代替

(例)Use plastics as a substitute for steel.用塑料做钢的代用品；

(例)If you cannot go yourself, please find someone to substitute you.如果你不能亲自去就找个人代你去。

（搭配）substitute for代替...，替换...， 取代...；substitute sth. [sb.] for用某物[某人]来代替

226. deserve vt. 应受，应得，值得

（例）The article deserves careful study. 这篇文章值得仔细研究.

227. discrimination n. 辨别，区别；识别力;差别，歧视  

（例）We are strongly opposed to racial discrimination.  我们强烈反对种族歧视。

（搭配）sex discrimination 性别歧视，racial discrimination  种族歧视

228. professional a. 职业的;专业的n. 专业人员

（例）That doctor has been accused of professional misconduct.   那位医生被指控违反医德。

（例）This survey is the work of a real professional.   这份调查是真正内行人做的.

（搭配）professional education 职业教育  a professional baseball player 职业棒球选手  professional skill 专业的技术

229. secure  a.安全的，可靠的 v. 使安全；保护……（免于危险）,保证，确实，确保

（例）The little boy felt secure near his parents.   那小男孩在父母身边感到安心。