不可缺少的

The pilot had hung out his lights, which was very necessary in these seas crowded with vessels bound landward

船主点上了夜航信号灯，在靠近海岸的这一带海面上船只来往十分频繁，点信号灯是一种不可缺少的安全措施。

Based on this Newton proposed the inertia definition and the law of inertia, but the inertin definition both does not have the physics significance and is the inaccurate personating analogy, also has the contradiction with Newton's second law, also does not propose what is the indispensable physical factor to maintain object movement.

牛顿在此基础上提出了惯性定义及惯性定律，但惯性定义既没有物理意义又是不确切的拟人化类比，又与牛顿第二定律有矛盾，也没有提出什么是维持物体运动不可缺少的物理因素。

In the world of law,legitimacy and controlling power are two indispensable parts of legal right.

在法的空间中，"合法性"和"支配力"是法律权利不可缺少的两个组成部分。

I think that it is essential emotion of one kind of a lifetime of people capital of lining.

我想它是一种人的一生里都不可缺少的情感。

In human and mammals, thyroid hormone is indispensable to normal growth,especially for the development of brain.

在人类和哺乳动物，甲状腺激素是维持正常生长和发育不可缺少的激素，特别是对脑的发育尤为重要。

When the mercury switch when slightly inclined to the perspective you need to connect the circuit to work, such a switch easy to use, simple operation, low price, it is an indispensable ideal switch.

当水银开关稍微斜时，达到你所需的角度即可接通电路进行工作，此种开关使用方便，操作简单，价格低廉，它是一种不可缺少的理想开关。

The application and principle of the Micro Controller Unit has been an important part of our living and production.

单片机原理及应用的关键技术已经成为我们生活生产中不可缺少的部分。

It is rich in human essential vitamins, amino acids, microelement, and good to health.

酒中含有丰富的人体不可缺少的维生素、氨基酸、微量元素、有益健康。

The microelement zinc is an essential body inner element , it participates in the various the human body physiology activity.

微量元素锌是体内不可缺少的元素，它参与人体的各种生理活动。

A mid-day nap is an integral part of the daily routine of many cultures, particularly those near the equator.

对于许多文明来说午觉是日常生活不可缺少的组成部分，特别是越加靠近赤道的文明。

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。