必须的

As the exosomes are derived from tumor cells, carry tumor antigens and share characters with most of the vaccines prepared previously, they are a kind of noncellular novel vaccine.

由于这种EXOSOME来自于肿瘤细胞，携带有肿瘤抗原，又有几乎所有目前研制的高效肿瘤疫苗所必须的公刺激信号的特性，强烈提示这是一种非细胞性的新型疫苗。

Actual experience shows that on the average the price of wheat and other nonperishable crops remains the same all year round except for an allowance for storage, interest and insurance charges.

实际经验表明，小麦和其他不易腐烂的谷物的平均价格水平在一年之中是相同的，这还没有考虑必须的仓储、利息和保险费用。

The case of AZ provides evidence supporting the existence of a genetically determined, specialised mechanism that is necessary for the normal development of human language.

AZ的案例提供了证据，支持一种遗传学决定、特定化的机制，这对于人类语言的正常发展乃是必须的。

In order to get reasonable prediction, 6 km modelgrid resolution and 18 km accuracy of orography are needed.

为了得到合理的模拟，6 km 的模式分辨率和18 km 的地形精确度是必须的。

In order to get reasonable prediction, 6 km modelgridresolution and 18 km accuracy of orography are needed.

为了得到公道的模拟，6km 的模式分辨率和18 km 的地形精确度是必须的。

He stresses that general revelation, like Scripture, is "necessary, authoritative, sufficient and perspicuous" for its distinctive purposes.

他强调，普遍启示与《圣经》一样，为了达成其特殊目标，它是「必须的、有权威性的、足够的和清晰的」。

Besides correct sampling procedures, proper sampling frequency is necessary to monitor the oil condition and the wear trends of machinery components.

除了要保证正确的取样程序外，合适的取样频率也是检查润滑油状况及设备零件的磨损趋势所必须的。

Besides correct sampling procedures, proper sampling frequency is necessary to monitor the oil condition and the wear trends of machinery component s.

除了要保证正确的取样程序外，合适的取样频率也是检查润滑油状况及设备零件的磨损趋势所必须的。

Besides correct sampling procedures, proper sampling frequency is necessary to monitor the oil condition and the wear trend s of machinery components.

除了要保证正确的取样程序外，合适的取样频率也是检查润滑油状况及设备零件的磨损趋势所必须的。

Many of the aza quinazolines have showed potent activity, such as pyrido[2,3-d]pyrimidine, pyrido [3,2-d]pyrimidine, pyrido[4,3-d]pyrimidine, pyrido[3,4-d]pyrimidine, and pyrimido [5,4-d]pyrimidine. Moreover, the compounds that the benzene in quinazoline ring was substituted by five-member rings, such as pyrrolo[2,3-d]pyrimidine, pyrazolo[3,4-d]pyrimidine, can also inhibit the EGFR and show bright prospects.

然而喹唑啉环并非EGFR抑制剂所必须的，在随后的研究中，人们发现许多氮杂喹唑啉类也有很好的活性，如吡啶并[2，3-d]嘧啶类、吡啶并[3，2-d]嘧啶类、吡啶并[4，3-d]嘧啶类、吡啶并[3，4-d]嘧啶类、嘧啶并[5，4-d]嘧啶类，也就是在喹唑啉环的5，6，7，8-位都可以氮杂，且都有活性。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。