必不可少

This is unfortunate, but it is essential.

这是不幸的事，但它是必不可少的。

In particular, there are two technology resources that I believe are non-negotiable essentials.

我认为其中有两项技术资源是必不可少的。

She and Esteban were the first to come to the house in Cataca, but while he found his path in all kinds of fruitful trades and businesses, she remained as an indispensable aunt in the family without ever realizing that she was.

她和Esteban是最早来到Cataca家里住下的，Esteban在许多不同的行业里都成功找到了自己的位置，她却留在了家中，成为一名必不可少的孩子姨妈，也没意识到自己的重要性。

At the same time the system can also control the temperature of the substrate and the evaporating source.

此外，为使系统能够正常运行，一个完备的工作软件也是必不可少的。

A good argument is essential, every now and then.

一个很好的论据是必不可少的，每一个现在，然后。

Money is essential to everyone's life.

钱对每一个人都是必不可少的。

Which is a very useful tool, and as we will see, essential to Excellence.

这是一个非常有用的工具，我们将看到的，必不可少的卓越。

Louisville, Kentucky is a place where basketball is an important part of life, and taking my son to an NBA exhibition game is very special.

在肯塔基州的路易斯维尔市，篮球运动是人们生活中必不可少的一部分。

Anti-terrorism robot system is mainly used to detect, eliminate and dispose bomb or other dangerous exploder. In additon, it can be used for lauching attack to rodman and terrorist. It is not only the essential equipment in anti-terrorist army, but also widely used in succor and battle.

反恐机器人系统主要用于代替人工，直接在案发现场进行侦察，排除和处理爆炸物以及其他危险品，也可以对持枪的恐怖分子及犯罪分子实施有效攻击，是反恐部队中必不可少的重要装备，同时也广泛应用于救援以及作战平台领域。

External store under wing is the necessary equipment for modern fighter, but due to the reason of nonlinear, there is not yet a good dynamic calculation model.

翼下外挂物是现代作战飞机的必不可少的装备，由于其非线性环节多，一般的有限元模型不能很好地反映它的动力特性。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。