1. naval a. 海军的
It was unable to turn around at the West end of Chambers Field at the Norfolk Naval Station.
2.navigation n. 航行
Navigation is difficult on this river because of the hidden rocks.
3.necessity n. 必需品；必要性
Necessity is the mother of invention.
Water is of vital necessity in the desert.
4. previous a. 先，前，以前的
It happened previous to his arrival there.
You must collect enough materials previous to your writing.
5. provision n. [pl.] 给养，口粮；准备，设备，装置
We set out with enough provisions.
6. pursue vt. 追逐；追求；从事，进行
Everyone has the freedom to pursue their dreams.
She wishes to pursue a medical career.
7.stale a. 不新鲜的，陈腐的
He always bought two loaves of stale bread.
The males think the females have talent for telling stale tales.
8. substitute n. 代用品 vt. 代替
Water is not a proper substitute for wine.
Only art can substitute for nature.
9. deserve vt. 应受，应得，值得
He has done nothing to deserve death.
You deserve a reward for being so helpful.
These proposals deserve careful study.
10. discrimination n. 歧视；辨别力
We should not have racial discrimination.
You should rely on your own discrimination.
Provide a Better Life for Senior Citizens Now we have a growing population of senior citizens. To ensure happy lives for them has become a focus of attention. Our traditiona
Passage Twenty-five (Exploration of the Titanic) After resting on the ocean floor, split asunder and rusting, for nearly three-quarters of a century, a great ship seemed to