不可缺少的

The Map Symbol Base System is not only one of the basic functions of Geographic Information System, but also an important research issue in GIS.

地图符号库系统不仅是地理信息系统中不可缺少的基础功能模块之一，也是GIS的一个重要研究课题。

I've used both an find them to be indispensable tools for getting things done efficiently.

我自己是两个都用，并且发现它们是使事情有效完成的不可缺少的工具。

Along with the continuous development and progress of society, the modern food packaging containers will be everywhere in life and indispensable for daily use.

随着社会的不断发展与进步，现代食品包装容器将成为生活中随处可见且不可缺少的生活用品。

We always get to know some strangers in this occasion.Asians often deliver their business cards with both hands respectfully,it seems to be an indispensable etiquette for them.

在这种场合陌生人相识，如果是亚洲人，他们往往开口之前先毕恭毕敬地用双手把自己的名片呈递给对方，这好像是不可缺少的礼节。

I think it will be an indispensable parallel to economic cooperation and political cooperation," he says."

我认为，教育合作是一条与经济合作和政治合作不可缺少的平行线，这是一个让双方可以更严肃地审视对方的好时机。

Be indispensable to; be a must to

必要的；不可缺少的

BF raceway is an indispensable part of the reaction area to the blast furnace operation, moreover the internal physical and chemical reaction is very complex.

高炉风口回旋区是高炉顺行不可缺少的重要反应区，而且回旋区内部的物理、化学反应十分复杂。

It is a recovery system and also an essential constituent in the civil action procedure system.

它是民事诉讼程序制度中的一项补救制度，是民事诉讼程序制度中不可缺少的一个组成部分。

Bread in the sense of food is the indispensable basis of human culture and civilisation.

面包在食品意义上是人文化和文明的不可缺少的基础。

The determination of cobalt is very necessary in guiding and controlling the manufacture in the process of extraction.

在钴冶炼过程中，对沉钴液中钴含量的测定是指导控制生产不可缺少的环节。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。