必不可少

And human resources information's management is many factories and mines, the company, an individual Institution's major problem, if depends on the human, the work load will be very big, if the company population has tens of thousands are even more, the artificial statistics will become cannot imagine, but if depends on the computer, only some simple operations then may prompt, obtain the information which accurately needs, therefore develops a human resources information management system management system is also essential, the human resources information management system management system mainly includes to the human affairs information statistics, the inquiry, the renewal and so on, this paper has manifested the database application system's characteristic, enables the system to have the security, data sharing, the transposability.

其中人才信息的管理是很多厂矿、公司、个体事业单位的一个大问题，如果靠人，工作量将很大，若公司人数有几万甚至更多，人工统计将变得不可想象，但如果靠计算机，仅一些简单的操作便可及时、准确地获得需要的信息，因此开发一个人才信息管理系统也是必不可少的，人才信息管理系统主要包括对人事信息的统计、查询、更新等，该论文体现了数据库应用系统的特征，使系统更具有安全性、数据共享性、可移置性。

DNA methylation is essential for silencing transposable elements and some genes in higher eukaryotes, which suggests that this modification must be tightly controlled.

DNA甲基化对于沉默的转座因子和真核细胞的某些基因是必不可少的，这表示DNA甲基化这一过程必须受到严格的控制。

Forest fires are essential for the ecology but when uncontained can cause a lot of damage.

森林火灾是必不可少的，但当无节制生态可能造成大量损失。

If benefits have resulted to our country from these services, let it always be remembered to your praise, and as an instructive example in our annals, that under circumstances in which the passions, agitated in every direction, were liable to mislead, amidst appearances sometimes dubious, vicissitudes of fortune often discouraging, in situations in which not unfrequently want of success has countenanced the spirit of criticism, the constancy of your support was the essential prop of the efforts, and a guarantee of the plans by which they were effected.

如果利益导致我国从这些服务，让它永远记住您的赞誉，并作为一个有启发性的例子在我们的史册，这在该情况下的激情，在每一个方向搅拌，有可能误导，以致有时出现可疑的，变化无常的财富往往令人沮丧，在这种情况下不unfrequently想成功了赞同的精神，批评，恒常您的支持是必不可少的支柱的努力，并保证这些计划的实施它们。

Cocktail has appeared in the occident before two centuries, and cocktail has been necessary and unreplaced art wine.

早在两个世纪以前，欧美地区就已经出现了鸡尾酒。如今鸡尾酒已经逐渐形成各种社交场合必不可少、难以取代的艺术酒品。

Internet is electronic vehicle for business on line, it turns to be unsplit tool for company for the purpose of collection, transferring and exchange for information, with the net work age availability, which input new vigor into IT service industry based on internet.

Internet作为电子商务的载体，已成为企业必不可少的信息采集、传输和交换的工具，网络时代的到来为基于Internet的IT服务业注入了新的活力

Art pulse serves as the background and the resource necessary for contemporary art to come into being, grow and thrive. It is the dynamic force that unyieldingly backs contemporary Chinese art.

文脉为当代艺术的建构，成长和壮大，提供了必不可少的背景和可利用资源，是中国当代艺术的坚强后盾。

I recommend direct lighting, quartz or polycarbonate where UVA is essential.

我建议直接照明系统，石英或聚碳酸酯的地方长波紫外线是必不可少的。

A good cap layer is necessary to keep oil/gas validly in a reservoir.

摘要优质、良好的盖层是储集层保存油气必不可少的条件。

At the same time, it was found that NAD(superscript +) was the essential factor for the conversion of vanillin into vanillic acid in vitro.

同时发现NAD是从香兰素到香兰素酸体外转化必不可少的因素。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。