必不可少

For example, in the design of antenna, it is always involve the imaginaries Bessel function, so these work are belonged to the base research work, but it is important.

本文对各向异性介质偶极天线辐射场的数值计算的研究以及各向异性介质波参数的数值计算的研究目前还没有文献系统介绍，但这些内容对进一步研究探地雷达辐射场的规律是必不可少的，尤其是传播常数，它在探地雷达的研究中仍然是一个非常重要的公式，对其的深入研究有利于对探地雷达资料的正确解释。

In the 40s and 50s, a bicycle is a necessary betrothal gift for bride in China.

早在四五十年代的中国，自行车就是结婚时男方必不可少的聘礼之一！

Nothing is beyond the power of human comprehension, but in order to harness thought force and make it do your bidding, work is required.

没有什是超出人类理解力的，但要想利用思想的力量，让它听从你的指令，劳动是必不可少的。

All levels educational management department also equally face the bigness challenge of the information era.

教务信息管理的计算机化将是建设现代化学校必不可少的基本条件。

Biotin: is an essential B-vitamin important for the growth of healthy cells.

生物素：是必不可少乙维生素重要的增长健康细胞。

The sculptural expressiveness of the green roof is necessary for the completion a sustainable biotope.

要想建造一个可持续性的生态单元，花园中雕塑表现就显得必不可少了。

Whether you are an armchair addict, or a bird-watching pioneer this guide and 70-minute CD are essential reference.

无论您是纸上谈兵上瘾，或观鸟先驱本指南和70分钟的CD是必不可少的参考。

Bleaching powder and NaClO can limite oxidation of wastewater.

目前油田的废水处理中，无论是物化处理还是生化处理，氧化过程都是必不可少的。

Charms are a must Blizzard, I hope you read that...

护身符是一个必不可少的暴雪元素，希望你明白我在说什么。。。

Iron, needed for red blood cell production, is essential for optimal intellectual, psychological and immunological development.

铁，所需的红细胞生产，是必不可少的最优智力，心理及免疫学的发展。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。