不可或缺

Owing to the difficulty of determining demand price elasticity and substitution of elasticity, and the complication of relationships between variable, it is hard to quantify the impairment of trade.

量化经济分析方法在平衡不同的政策目标，削减关税和其他贸易壁垒，授权贸易报复水平中有不可或缺的作用。

Elastin is an essential and widespread structural protein in charge of the integrity on tissues and organs.

弹性蛋白是生物体中一个不可或缺且广泛分布的构造性蛋白，负责了组织以及器官的完整性。

It has become an indispensable electronic organ for me.

对我而言，手机是不可或缺的电子器官了。

Maybe today we dare not assure our demonstration can make history reappear, but we must show the points of our own accurately as possible as we can. Through the evolution research to the fish emblazonment reflecting the ideas of ancient designs, it is indispensable contents to the theoretical research of modern designs.

或许今天我们谁也不敢保证自己的论证就一定能够真正的再现历史，但我们必须站在今天的时代高度尽可能准确论述自己的见解，通过对鱼形纹饰的流变研究来折射古代的设计思想，这是现代设计理论研究不可或缺的重要内容。

We all know that we are enable to lack of tree.

全世界都知道树木对我们是不可或缺的。

Next, to add enchantment to convenience, overall city planning is indispensable.

其次，要在方便的同时再加上魅力元素，完整的城市规划是不可或缺的。

When discussing the causes of endangerment, it is important to understand that individual species are not the only factors involved in this dilemma.

不同意论断的后半句话。野生动植物是宝贵的自然资源，是生态环境的重要组成部分，也是人类生存与发展不可或缺的物质基础。可以说人类社会的发展史，就是人类利用野生动植物资源不断发展的历史。

There he received capacity and endowment for the reality of human existence.

在那里，他获得了人的生存所不可或缺的能力和禀赋。

It is indispensable for the enforcement of environmental laws.

这对于环境法律的有效实施是不可或缺的。

Concerning the right and duties of an independent state it is commonly accepted that those are integral elements of a truly independent state, including:the right of a state to exercise jurisdiction over its territory and permanent population;to engage upon an act of self-defense in certain situations;not to intervene in the internal affairs of other sovereign states;not to enforce its laws in the territory of another state.

该宣言还包括任何援助或援助的暴力推翻一个国家的政府禁止旨在颠覆分子。关于权利和义务的独立国家是普遍认为，这些都是不可或缺的要素，一个真正独立的国家，其中包括：（1）一国有权行使其领土和管辖权的常住人口；从事经自决行动，在某些情况下国防；不干预其他主权国家的内政；不执行在另一国领土的法律。

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。