The British constitution is to a large extent a product of the historical events.
The sequence of historical plays by Shakespeare is still the masterpieces in today's literature.
a.（to, for） 必不可少的，必需的
Air and water are indispensable to life.
It is well known that knowledge is the indispensable condition for expansion of mind.
Struggling for survival is a human instinct.
n.监听器，监视器，检测器；（计算机）显示器；（学校的）班长 vt. 监听，监视；监测，检测
Stock-market analysts monitor a great variety of financial indicators.
a.预备的，初步的 n. （常pl. ）准备工作，初步行为
For a possible major overhaul, the tutor expects a preliminary draft of each paper two weeks before the final due date.
They were very excited because they had passed the preliminary interview with IBM.
n.抗议，反对 v. 抗议，反对
Loud protests were heard when the decision was announced.
Guests can protest about the bad service of the restaurant to the owner.
A successful businessman should be able to readily accommodate to the changing economic conditions.
It's said that a person's fate is relevant to his character.
About 3 million people die because of the relevant diseases derived from smoking every year.
Researchers discovered that plants infected with a virus give off a gas that activates disease resistance in neighboring plants.
The environmentalists put up lots of resistance to fur-clothing companies.
粉vi.碎；猛撞 vt. 粉碎；猛击；使破灭，使失败 n. 破碎（声）；猛撞；轰动的演出，巨大的成功
If you smash an egg on a stone, the egg will definitely smash.
The cooperation among countries should be strengthened to protect the environment.
Most countries in Europe were in a mess during the period subsequent to World War II.