必不可少

Separation/preconcentration is always necessary for improving sensitivity and selectivity of analyt...

在分析科学中，为提高分析方法的灵敏度与选择性，分离与富集是必不可少的，其中柱材料分离富集占有十分重要的位置。

Separation/preconcentration is always necessary for improving sensitivity and selectivity of analytical method.

在分析科学中，为提高分析方法的灵敏度与选择性，分离与富集是必不可少的，其中柱材料分离富集占有十分重要的位置。

Every diocesan Bishop is invited to make use of indispensable instruments of communion and cooperation within the diocesan Catholic community: the diocesan curia, the presbyteral council, the college of consultors, the diocesan pastoral council and the diocesan finance council.

每位教区主教都应充分利用教区团体内必不可少的共融与合作的工具：主教公署、司铎谘议及参议会、牧灵委员会、财务委员会等。

Dream is the necessary psychal power in the common life.

理想在生活中是一种必不可少的精神动力。

A pyrometric calorimeter as an indispensable instrument for the measurement of the distribution of the thermal load within the furnace and the study of heat transfer in the furnace has long been given attention.

热流计作为测量炉膛热负荷分布、开展炉膛热交换研究必不可少的测试工具早已受到重视。

The physical test of dosimetry on rotating gamma system has to be made before the clinical use of a radiation medical treatment equipment. It is a systematic test for design, processing and fabrication, fixing and electric controlling of stereotactic radiosurgical set up.

旋转式伽玛刀的辐射剂量学指标的物理测试在放射性医疗设备投放医院正式临床使用前是必不可少的，是对设备及其附件的设计、加工制造、安装以及电气控制系统等的全面综合性检定。

Want to obtain good rank on search engine, many retrorse link is an essential condition.

要在搜索引擎上获得好的排名，大量的反向链接是必不可少的一个条件。

Among those university students who will graduate soon, some prefer /wish to retune to their hometown to work , others volunteer to work in the underdeveloped areas-regions.

如今学生们热衷于学习电脑，因为他们很清楚在信息时代这是必不可少的技能。

Injured cells appear to require synthesis of some essential cell materials, that is, ribonucleic acid or enzymes before recovery is accomplished.

受杀伤的细胞似乎要合成一些必不可少的细胞物质，如核糖核酸或酶类，然后才能达到完全复原。

Injured cells appear to require synthesis of some essentialcell materials, that is, ribonucleic acid or enzymes before recovery isaccomplished.

受杀伤的细胞似乎要合成一些必不可少的细胞物质，如核糖核酸或酶类，然后才能达到完全复原。

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。