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After-class activities are treated as a indispensable part of school life.

课外活动是学校生活不可缺少的一环。

The connotation of sustainable tourism which sparkpluged by《The Agendum of Tourism in 21 Century》, promulgated by the WTO and WTTC,indicates clearly that community participation is a very important and indispensable content of tourism development.

1997年世界旅游组织、世界旅游理事会与地球理事会联合制定并颁发的《关于旅游业的21世纪议程》所倡导的旅游业可持续发展明确提出把居民参与当作旅游发展过程中的一项重要内容和不可缺少的环节。

The pump and the air blower already became present to produce the indispensable machinery, each has their form in national economy's all quarters, therefore understood that their performance is not big regarding the production help.

泵与风机已经成为了现在生产中不可或缺的机械，在国民经济的各方各面都有它们的身影，因此了解它们的性能对于生产的帮助来说不可谓不大。

Air as well as sunlight, needless to say , is indispensable to our daily life.

空气正如阳光一样，不必说，它是我们日常生活中必不可少的。

Air as well as sunlight be,needless to say,indispensable to our daily life .

不必说，空气象阳光一样，对我们的日常生活不可缺少。

A strong army and a strong airforce are indispensable to the defence of a land locked country.

一个强有力的陆军和一个强有力的空军对于保卫一个四周皆陆地的国家来说是必不可少的。

Under president Bill Clinton, secretary of state Madeleine Albright described the US as the indispensable power .

在总统比尔·克林顿下，国务卿Madeleine·Albright将美国描述成不可缺少的力量。

Polyethylene units are indispensable for alkene plants and their normalperformance is vital to regular operation of the overall plant.

中国石油总公司辽阳分公司低压聚乙烯装置的改造、调优工程，对于烯烃厂的生产运行、质量提升已及经济效益关系重大。

In order to create architectural amiability, the economical requirement of the design, the improvement of function and restriction in the form are indispensable.

创造平易建筑需要在经济上采用限额设计、在功能上力求完善、在形式上有所制约，通过对适用、经济、美观三要素的合理综合进行优化设计，符合我国建筑发展的现状。

The validity of law, that is the binding power of law, is an indispensable element of law.

法的效力，也就是法的约束力，是法不可缺少的要素之一。

They have quite a lot of work to do.

他们有许多工作要做。

Let us give you a more elaborate example of this process.

让我们给你这个过程的更多的详细例子。