查询词典 primary key

In website development, system security problem is the primary consideration of key issues. The ASP.

在进行网站开发时，系统安全性问题是首要考虑的关键问题。

So the primary school is key period to formation of values of sex.

所以小学阶段是性观念形成的关键期。

The phase in the primary school is the key period for the children's social development.

小学阶段是儿童社会性发展的关键阶段。

As the variation of QRS complex wave is the primary reference criteria on clinical diagnosis of arrhythmia, exact extraction of the features of QRS complex wave is the key problem.

QRS复合波群的形态变化是心律失常临床诊断的重要参考标准，因而准确地提取QRS复合波群的波形特征是心律失常自动化诊断中面临的关键问题。

This is key to the reform of primary and middle school science curriculum and difficult.

这也是我国中小学科学课程改革的重点和难点。

The synthesis of the pentacyclic skeleton of Et-743 and the construction of the five chiral centers thereof.1. The core pentacyclic skeleton of phthalascidin was constructed with L-dopa as the starting material via thirteen steps. First, two basic synthons, the C-1 functionalized tetrahydroisoquinoline compounds 8 and N-protected Z-dopa derivative 9, were prepared from L-dopa. They were coupled via amide bond to form the dipeptide compounds 10, which were the first key intermediates. Then the primary hydroxyl groups were transformed into the corresponding amino aldehydes 11 via Swern oxidation. Followed by the intramolecular Pictet-Spengler cyclization, the pentacyclic compounds 12 were synthesized.

五环骨架的构建及五个正确手性中心的确立：1.1我们以L-多巴为起始原料，经过多步官能团保护和转化合成了基本结构单元8然后和苯丙氨酸衍生物9，通过缩合反应生成酰胺中间体10，经Swern氧化得到醛化合物11，然后再次利用分子内改良的Pictet-Spengler反应一步构建c，d两环，得到五环骨架化合物12，最后，实现了21-位羰基向氰基的转化，得到了C-1位官能化的化合物14，化合物14不但具有和Et-743一致的五环骨架，而且分子中五个手性中心立体构型也与其完全相同：其中，3，位和13，位的手性中心由原料L-多巴带入，而1，位，11，位和21，位手性中心则通过不对称诱导而确立。

The M51 spiral galaxy was used as the primary design key.

在螺旋星系M51是作为主要的设计关键。

Spirometric confirmation is a key component of the diagnosis of COPD and primary care practitioners should have access to high quality spirometry.

肺功能检测是诊断COPD的一个关键依据，初级保健医生们应该拥有高质量的肺功能仪。

Spirometric confirmation is a key component of the diagnosis of COPD and primary care practitioners should hae access to high quality spirometry.

肺功能检测是诊断COPD的一个关键依据，初级保健医生们应该拥有高质量的肺功能仪

Key words:primary liver cancer;sublingual varix;mechanism of formation

原发性肝癌是危胁人类生命健康的主要恶性肿瘤之一。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。