219. navigation n. 航行

I need to buy auto GPS navigation , please and contact us.

我们需要购买汽车GPS导航，请与我们联系。

220. necessity n. 必需品；必要性

The fund-raising ability is largely a product of experience and necessity.（2009年12月大学英语四级考试试题）

221. previous a. 先，前，以前的

In 2003, when Cambridge University appointed Alison Richard, another former Yale provost, as its vice-chancellor, the university publicly stressed that in her previous job she had overseen “a major strengthening of Yale’s financial position.” （2009年12月大学英语四级考试试题）

222. provision n. [pl.] 给养，口粮；准备，设备，装置

upheld the government’s right to obtain bookstore and library records under a provision of the USA Patriot Act.（2006年12月24日大学英语四级(CET-4)真题试卷(A卷)）

223. pursue vt. 追逐；追求；从事，进行

Miller developed a 7-step process to help potential job seekers assess their current situation and beliefs, identify their real passion, and start on a journey that allows them to pursue their passion through work. （2007年6月23日大学英语四级(CET-4)真题试卷(A卷)）

224. stale a. 不新鲜的，陈腐的

Running water never grows stale.流动的水永不陈旧。

225. substitute n. 代用品 vt. 代替

The coach let me substitute No.9 in the second half.

下半场，教练让我替下了9号。

He entered the game as a substitute.

他作为一名替补参加了比赛。

226. deserve vt. 应受，应得，值得

you probably deserved it （2008年12月大学英语四级考试真题）

227. discrimination n. 歧视；辨别力

What does the author think of the current situation regarding racial discrimination? （2006年6月17日大学英语四级(CET-4)真题试卷(A卷)）

228. professional a. 职业的，专门的

She wants Amanda to get professional care.（2009年6月英语四级考试真题与答案）

229. secure a. 安全的，可靠的

Our goal is to China's tourism industry to create a secure booking, stability, integrity, anti-monopoly market environment.

我们的目标是为中国的旅游，预订业创造一个安全，稳定，诚信，反垄断的市场环境。

230. security n. 安全，保障

Generational tensions are being fueled by continuing debate over Social Security benefits, which mostly involves a transfer of resources from the young to the old. （2006年6月17日大学英语四级(CET-4)真题试卷(A卷)）

231. scratch v. /n. 抓，搔，扒

He has a deep scratch on his face.

他脸上有道深的抓痕。

Scratch where it itches. That's it.

痒了就抓就是这样简单的！

232. talent n. 才能，天资；人才

Yet the talent flow isn’t universal. （2009年12月大学英语四级考试试题）

233. insurance n. 保险，保险费

Many white institutions, including some leading universities, insurance companies and banks, profited from slavery. （2006年6月17日大学英语四级(CET-4)真题试卷(A卷)）