不可缺少的

Daily weather data are required for many applications and assessments.

日气象资料为许多应用与评估工作不可缺少的资讯。

Extracurricular Actives of out classes is indispensability of school life.

课外活动是学校生活不可缺少的一环。

Silica glass is an important material in fields of microelectronics, optical fiber communication, electric lighti...

石英玻璃是微电子、光通信、电光源、化工、航天和核技术等领域不可缺少的关键材料。

Oscillators in communications, broadcasting, television, measurement, and computer systems an indispensable basic circuit is widely used.

振荡器是通信、广播、电视、测量、计算机等系统中不可缺少的基本电路，应用十分广泛。

Televisions have become something that influences the whole world and that people can't live without.

电视已经成为一种影响全世界，而且在人们生活中不可缺少的东西。

Organic photoconductive materials have been extensively applied to electrophotography, laser printer, photocell, holography, which are the important high-technological materials in modern information society.

有机光电导材料（Organic Photoconductive Material，简称OPC）在静电复印、激光打印、光电池、全息照像等领域有广泛应用，已成为现代信息社会不可缺少的高技术材料。

Because doped lithium niobate crystals have the advantages of easy growth, low cost, stable performance and etc., these cryst...

高密度数据存储技术始终是信息技术和计算机技术发展中不可缺少的关键环节。

Thus the connecting rod is examined in the production to be frequent and the also essential link.

因而连杆检测成了生产中频繁而又不可缺少的环节。

Later,when Arabic numerals become common,the abacus was no longer necessary.

然而，对于中国人来说，算盘仍是一种不可缺少的图解计算工具。

Digital simulation is an important field in the analysis and design of the TV-guided aerial bomb.

数字仿真是电视制导炸弹系统分析和设计过程中不可缺少的环节。

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。