必不可少

On the first one, one may find that according to Collingwood, the past is a necessary element in the idea of progress, it should always be comprehensive, and that there should be multi-ply standards concerning the idea.

在前一个层次上，柯林武德的进步思想包含着如下涵义：过去是进步观念中必不可少的因素；进步必须是全面的；进步应该具有多种标准。

The days are colorless and tasteless but essential, life is just like that.

日子无色无味却都是必不可少的，生活就是如此。

In front of me stood the essential tools of the intelligence officer's trade - a desk, two telephones, one scrambled for outside calls, and to one side a large green metal safe with an oversized combination lock on the front.

在我的前面是聪明的贸易官员必不可少的工具——一张桌子，两部电话，一台是防外部窃听的电话，在另一边是一个很大的、绿色的、在它正面锁着大号的锁的的保险柜。

Comeuppance is an important element in the erotic fictions in Ming and Qing dynasties. It is a necessary link between lust and emptiness.

明清艳情小说中的因果报应观念，是情节结构中的重要因素，是由欲的极度张扬到曲终奏雅的"空"之间必不可少的转换环节。

Power control is one of the necessary key techniques for mobile communication systems. The frame structure of WCDMA communication system is different from those CDMA commination systems, which have only one type of traffics. In addition, multimedia services have different quality of service requirements. Thus the power control for WCDMA communication system will different from that in narrow band CDMA communication systems.

功率控制是CDMA移动通信系统中必不可少的关键技术之一，WCDMA移动通信系统的结构不同于单一业务的CDMA移动通信系统，且多媒体业务有不同的服务质量要求，因此，WCDMA多媒体移动通信系统中的功率控制将不同于单一业务的CDMA移动通信系统中的功率控制。

It is common knowledge that a robust health is a must to a happy life.

大家都知道，对于一个幸福的生活，好身体是必不可少的。

It's essential to communicate with your partner.

这是必不可少的沟通与您的合作伙伴。

The determination of the trademarkinfringement in the comparative advertising is the fundamental issue, because it is anessential link in the judicial practice and plays a key role in the penalty of the entirecase. So it is essential to research and discuss the problem specially and deeply.

而比较广告中商标侵权的认定则是其中最基本的问题，也是司法实务中必不可少的环节，这一认定对整个案件的判罚都起着关键性的作用，因此有必要对这个方面进行专门的、深入的研究和探讨。

Rigging and fitting my Mast and Sails; for I finish'd them very compleat, making a small Stay, and a Sail, or Foresail to it, to assist, if we should turn to Windward; and which was more than all, I fix'd a Rudder to the Stern of her, to steer with; and though I was but a bungling Shipwright, yet as I knew the Usefulness, and even Necessity of such a Thing, I apply'd my self with so much Pains to do it, that at last I brought it to pass; though considering the many dull Contrivances I had for it that sail'd, I think it cost me almost as much Labour as making the Boat.

此外，我还配上小小的桅索以帮助支撑桅杆。我在船头还做了个前帆，以便逆风时行船。尤其重要的是，我在船尾还装了一个舵，这样转换方向时就能驾御自如了。我造船的技术当然不能算高明，然而知道这些东西非常有用，而且是必不可少的，也就只好不辞辛劳，尽力去做了。在制造过程中，我当然几经试验和失败。如果把这些都计算在内，所花费的时间和力气，和造这条船本身相差无几。

Although the working conditions of geodetic less difficult, complex, but still the field is essential.

虽然现在大地测量的工作条件没有以前那么艰苦、复杂了，但到野外工作仍然是必不可少的。

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。