不可缺少

To study biological active elements which maintain normal biological functions is one of the new scopes of life sciences.

在活的有机体中，维持正常的生物功能不可缺少的各种生理活性元素是当今生命科学研究中的一个崭新领域。

Group in this village of 132 households, 590 people, paper-cutting in their lives has become an indispensable part.

这个村小组有132户人家，590多人，剪纸已成为他们生活中不可缺少的一部分。

Indispensable stage props are six sabres that take on the role of dance partners in the most varied of configurations and occasionally seem more impetuous and wilful than a partner of flesh and blood.

舞蹈中不可缺少的道具是6个佩剑与之各种舞蹈编排，让其看起来比那些真的血肉之躯更具猛烈的野性的。

But in those critical days it was of course indispensable and a strong support for the riflemen in their snow holes.

但在那些尖峰时刻，它是雪洞里的步兵不可缺少的强有力的支持。

The retarder is essential for ensuring the rheology of cement slurry under high temperatures, but the retarders currently developed in China can only be used in service under 180℃.

缓凝剂对于保证水泥浆在高温下的流变性是不可缺少的，但目前国内自主开发的高温缓凝剂使用温度均低于180 ℃。

Recessions are a healthy and an integral part of a market economy.

衰退是市场经济的一个健康和不可缺少的一部分。

To construct the harmonious society has been one of the most important goals in the development of Chinese society. Being the rapidest industry in the world , tourism industry takes important role in constructing the harmonious society ,and is indispensable to realize the goal.

构建和谐社会已经成为我们当今中国社会发展的一个重要目标，旅游业是当今世界上发展速度最快的产业，在构建和谐社会中有着重要的作用，是和谐社会中不可缺少的一个元素。

Queueing theory is widely used in computer network, communication, traffic and other common affair. It has become the important tool of analysis and design of these systems.

排队论在计算机网络、通讯、交通以及其他公共事业中的应用越来越广泛，已成为分析和设计这些系统的一个不可缺少的工具。

Self-confidence is an important condition for people to complete everything, and is the positive essential condition for pathbreakers and pushers, and also an important character for us to live.

自信心是人们顺利完成各种活动的重要条件，是勇于开拓进取者不可缺少的积极心理品质，也是做人的重要品格。

And pipers. A few years ago to several hundred years after the baptism of 'Scottish Pipe Band has become a wedding party' Carnival 'indispensable instrument.

和风笛。是几年前的事~经过几百年的洗礼'风笛已经成为了苏格兰婚礼，聚会'狂欢节'不可缺少的乐器。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。