不可缺少的

The web education is essential for the modern education. its openness and interaction overwhelms the traditional education.

网络教学是现代教育不可缺少的一部分，其开放性和互动性是传统教学无法比拟的。

SEO rectifies a station to optimize the key that is search engine sale, it is the indispensable link in integral network sale more.

SEO整站优化是搜索引擎营销的重点，更是整体网络营销中不可缺少的环节。

Steeps medicine machine is an important part of sewage treatment industry .

泡药机作为污水处理系统中不可缺少的一部分，其好坏直接影响着处理的效果。

The study of Drug Toxicology plays an important role in guiding the research and development of new drugs and in the risk assessment of drugs' toxicities.

药物毒理学研究是指导新药研究与开发，对药物的毒性进行危险性评估不可缺少的重要手段。

The construction of knowledge is an essential part in foreign language learning since it widens our cognitive context.

外语学习中外语知识的建构对扩大认知语境有益，是外语学习不可缺少的部分。

As you can see, the outdoor sink is an indispensable part of outdoor kitchens.

您能看到，室外水槽是室外厨房的一个不可缺少的部分。

There is no food that is essential, but there are nutrients that are necessary for good health.

没有哪种食物是必不可少的，但有些营养成分对身体健康是不可缺少的。

International organizations are also indispensable in terms of the protection of refugees.

国际组织在难民保护中的作用也是不可缺少的。

The phosphoric-chemical industry is important and basic for the national economy. Its products such as phosphoric acid, various phosphate and phosphate fertilizer, which are the indispensable and basic material for many industries, are widely used.

磷化工是国民经济的一个重要基础产业，其主要产品磷酸、各类磷酸盐和磷肥等作为工农业生产不可缺少的基础原料，应用十分广泛。

In the PE blowing procedure, mold temperature, mold pressure mold duration are the essential conditions and the mold temperature determine the decompose speed of blowing agent AC and cross link agent DCP.

在PE发泡工艺中，温度、时间、压力是不可缺少的工艺条件，其中温度决定了发泡剂、交联剂的分解速度。

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。