不可缺少的

For a successful event, visional promotion is a must to enhance its attraction.

具吸引力的视像宣传是成功活动不可缺少的一环。

Since the 1990s, the trading volume of derivative financial instruments has shown a tendency to rise year after year.

自九十年代以来，衍生金融工具的交易量呈上升趋势，已经成为整个市场体系不可缺少的组成部分。

Wind load is a kind of important loads to the buildings, and it is indispensable in the structure design.

风荷载对于建筑物来说是一项非常重要的荷载，是建筑结构设计中不可缺少的。

In dual-frequency laser interference measuring system Wollaston prism is an indispensable and important device,which can separate the incident beam in to measurement beam and reference beam according to the polarization direction of dual-frequency laser,so as to realize the high accuracy measurement.

在双频激光干涉测量系统中，Wollaston棱镜是不可缺少的重要光学元件，它可将双频激光按偏振方向分为测量光和参考光，从而实现高精度测量；但是，如果Wollaston棱镜的安装方位相对入射光线方向以及与聚焦透镜距离不同时，测量结果将会不同。

Appropriate dietary guide and alimentotherapy is one of the most important sections of the treatment of stable patients with COPD and cor pulmonale.

对缓解期COPD和肺心病患者进行正确的膳食指导和营养干预治疗是其综合治疗不可缺少的一个重要方面。

In more than 20 years of development, it provides scientific bases for the assessment of a research project or approvement of all achievement based on literature retrieval, becoming an important role in science and technology management.

在二十余年的发展中，为科研立题、立项、成果鉴定、评估、报奖等提供科学依据，已经成为科技立项、成果鉴定、报奖、评估不可缺少的环节，在科技管理工作中发挥了重要作用。

Automatic filling machine for daggy water LTGJ-7.5-11 is an indispensable equipment on the production line. Its framework, film-conveying system, traction system, heat-enveloping and cutting system and filling equipment are made of stainless steel with good conformity with food production requirement.

袋装水自动灌装机LTGJ-7.5-Ⅱ是袋装水生产线不可缺少的关键设备，该包装机的机架、送膜进膜系统、牵引机构、封热切断装置、灌装设备等，均采用不锈钢材料精致而成，符合食品生产要求。

Automatic filling machine for daggy water DBJ-7500-11 is an indispensable equipment on the production line. Its framework, film-conveying system, traction system, heat-enveloping and cutting system and filling equipment are made of stainless steel with good conformity with food production requirement.

袋装水自动灌装机DBJ-7500-Ⅱ是袋装水生产线不可缺少的关键设备，该包装机的机架、送膜进膜系统、牵引机构、封热切断装置、灌装设备等，均采用不锈钢材料精致而成，符合食品生产要求。

Dr. Barklair, the Britain hermeneutist of the famous Ireland "Bible", pointed out in his "Full of Flowery" that there were three indispensable factors in happy life that is hope, job and love.

当代英国爱尔兰著名《圣经》注释学家巴克莱博士在《花香满径》开篇中指出：&幸福的生活有三个不可缺少的因素：一是有希望，二是有事做，三是能爱人。&

At the present time, liquor is indispensable in the life of Miao nationality .

如今，在苗族人民的生活中，酒已是一种不可缺少的东西。

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。