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The phenyl-substituted quinoxaline ring endows the polymers with high thermal stability,hydrolysis stability,and good solubility in organic solvents.

苯基取代喹噁啉环赋予了PPQ优良的耐热稳定性、耐水解性以及在有机溶剂中良好的溶解性。

Because of fluoride substitutions and quinoxaline structures, two new compounds are electron deficient. With alkyl substituted fluorenes, the two new compounds both have good solubility.

新的化合物因为含有氟取代基和喹喔啉结构使得整个分子呈缺电子状态，同时烷基取代的芴使得材料具有良好的溶解性。

Dioxide quinoxaline formaldehyde semicarbazones and imines were synthesized by the reactions of 1,4-dioxide quinoxaline formaldehyde with aminourea or substituted anilines.

用1，4-二氧喹喔啉甲醛与氨基脲、苯胺、取代苯胺等反应，合成了11种1，4-二氧喹喔啉甲醛－缩氨脲和醛亚胺。

In Palestinian Rabbinism the Word is very often mentioned, at least in the Targums: it is the Memra of Jahveh which lives, speaks, and acts, but, if one endeavour to determine precisely the meaning of the expression, it appears very often to be only a paraphrase substituted by the Targumist for the name of Jahveh.

在巴勒斯坦rabbinism字是很常提到的，至少在targums ：它是为门拉的jahveh其中生活，讲话时，和行为，但是，如果一个力求准确确定含义的表达，它似乎很往往也只能是意译取代由targumist为名称的

372Bp mitochondrial cytochrome b DNA of blue fox, red fox, raccoon dog, and wolf were sequenced. Combined with the DNA fragments of dog, simien fox, and African wild dog, sequences were aligned and analyzed. There are 113 nucleotide sites substituted (30%).

通过对犬科的赤狐、蓝狐、貉和狼4种的线粒体细胞色素b约372bp DNA片段序列分析，结合GenBank中狗、西门豺和非洲野犬3种的该区段DNA序列的比较，共发现113个核苷酸位点存在变异(约30%)。

The conventional numerical simulation of a reverberant field as a launch acoustic environment was introduced. Following the reciprocity theorem used in the coupled FE-BE model, the structural response due to reverberant acoustic excitation was substituted by the sound pressure caused by force excitation on the structure, then the output response power spectrum density of the coupled model subjected to reverberant environment was evaluated based on the stochastic analysis principle.

首先介绍了传统的构建混响声场的数值模拟方法；其后利用声振耦合中的互易定理，将混响声场的激励问题转化为结构模型上力激励引起的场点声压响应问题，并采用随机分析原理，用谱分析方法推导了结构在混响声场激励下的响应计算公式；最后建立了航天器典型结构的声振耦合模型，并分别用传统方法和利用互易定理的方法进行了数值模拟。

It may be due to the following two reasons: 1 High steric hindrance caused by rigid structure of substituted fluorenone preventsthe approach of the chiral reductor;2 The prochiral center is, moreover, linked to two coplanar aromatic rings, which due to strong conjugation are highly electronically similar and thus it becomes extremely difficult to distinguish between them.

主要是以下两个原因：1取代芴酮的刚性结构产生高的空间位阻，阻止了手性催化剂的接近；2潜手性中心旁的两个芳香环不仅立体构型非常相似，而且高度的电子相似，很难被手性配体识别。

It has stronger I/O interface to connect with industrial process compared to the common computer and has basically substituted of the logical control of traditional relay and contact devices, thus become the basic installment in automation control system.

从广义上讲，PLC是一种计算机系统，比一般计算机具有更强的与工业过程相连接的输入输出接口，已基本取代了传统的继电器和接触器的逻辑控制，并成为自动化控制系统的基本装置。

Compared with CT or MRI,SPECT study can make out the location and size of infarction in the much earlier stage,and provide reliable evidence for the ultra-acute treatment of hemorrhage and infarction,or as MRI in the revealment of smaller lesion in and deep brain,so these three kinds of diagnoses method can not be substituted each other.

但对脑出血与脑梗死的鉴别不如CT对脑干及脑深部，较小病灶不如MRI显示清楚，因此三种检查方法不能互相取代。

There were two approaches to modify T1-11: the alternation of N6-substituted functional groups and the modification of ribose.

我们替换T1-11分子结构中N6-位置的取代基，并建立具有代表性的分子库。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！