查询词典 necessary

It is a strong oxidizer that combines readily with many elements to form an oxide and is necessary to support combustion.

氧是一种强氧化剂，很容易同许多元素反应，生成氧化物。氧还是维持燃烧的必需品。

Oxygen is necessary for all forms of life.

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The calculation method represented in this paper is very simple and convenient. By comparing the relative errors, the method is better than other methods. Moreover, it can be used to calculate molar Gibbs free energy and molar enthalpy of formation of all complex oxysalt minerals including a series of titanate whiskers that author's group has studied for many years. The thermodynamic data for the series of titanate whiskers provide necessary fundamentals to their preparation.

本文提出的方法计算步骤十分简单，从相对误差来看，本方法和其他方法相比精度较好，可以计算包含本课题组长期研究的钛酸盐系列晶须的所有复杂含氧盐矿物的摩尔生成Gibbs自由能和摩尔生成焓，为热力学在钛酸盐系列晶须制备中的应用提供理论支持。

Furthermore it is necessary to study the problems such as the optimum arrangement of package materials inside the reactor and the changes of the working status of the package material at different quality of raw water.

有必要进一步研究填料的最优布置方式及在不同的水源水水质条件下填料运行状态的变化等问题。

It is necessary to store in sealed package to isolate the LiNiO product from HO and CO for keeping its storage performance.

因而单纯的LiNiO_2电极材料在潮湿的空气中具有比LiCoO_2更差的贮存稳定性，为了保证LiNiO_2的电化学性能，必须隔绝水分和二氧化碳，采用干燥密封条件。

If necessary have two sets of pads.

如果有需要的话请准备两套来令片。

If necessary,key errors may be corrected;words,sentences,paragraphs,or pages may be added or deleted ; margins can be established; page length can be defined; and many other functions that involve the manipulation of the written word can be performed.

若必要的话，键入的错误可以被修正过来，可以对单词、句子、段落或整页进行添加或删除；可以建立页的边缘空白；可定义页长；其他凡涉及对字处理的功能都能够执行。

Further studies on PVOD may help confirm whether a change in its classification as a type of PAH is necessary.

对PVOD进行进一步的治疗将有助于确定改变将PVOD做为PAH的一种类型是否必要。

I only feel mild pain. I do not think a pain-killer is necessary.

我只感到有轻微的疼痛，我想用不着吃止痛片。

P: I only feel mild pain. don't think a pain-killer is necessary.

我只感到有轻微的疼痛，我想用不着吃止痛片。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。