大学英语：security n. 完全;保障;把握

secure v. 保卫，保证，获得 adj. 完全的

We are all concerned for the security of the passengers. (我们都很担心旅客的安全。)

Children rely on their parents for love and security. (孩子们靠父母给他们爱和完全感。)

The girl delivered her speech with great security. (那个女孩满怀信心地讲演着。)

She felt secure only when she made sure that both doors were locked.(只有确信两道门都锁上了时，她才感到放心。)

We all dream of living a quiet and secure life. (我们都梦想过上平静、安定的生活。)

His carefulness secured him from making more mistakes. (他的细心保证了他不犯更多的错误。)

His father couldn't believe that he secured such a good job. (他父亲不相信他找到了这么好的一份工作。)

(注意：securities 指证券)