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In the process of laboratory study, oxycodone was prepared by oxidating thebaine at 6,14-position under oxydol, hydrodeoxidizing 7,8-position double bond and 14-position ether under palladium catalyst. Furthermore, N-methyl of oxycodone was isolated byα-chloro-ethyl chloroformate under anhydrous condition and protection of 14-position hydroxyl to obtain noroxycodone, which was further converted into methylnaltrexone by N-alkylation in presence of cyclopropyl bromomethane, then by isolating 3-position methyl of methylnaltrexone under boron tribromide, becoming hydrochloride to prepare target compound, natrexone hydrochloride.

实验室工艺方面，本文首先用双氧水氧化蒂巴因的6-位和14-位、在钯炭催化下加氢还原7-8位双键和14-位醚合成羟考酮，然后提出并优化了在无水和14-位保护的情况下，用氯甲酸-α-氯乙酯脱去羟考酮的N-位甲基合成去甲羟考酮，再用环丙甲基溴将去甲羟考酮的N-位烷基化合成甲基纳曲酮，最后采用三溴化硼脱去甲基纳曲酮的3-位甲基和成盐酸盐合成盐酸纳曲酮。

Medicine is used to unclose and seize mysterious physiology, pathology and pathogeny of human body, and solve problems pointedly and flexibly, but it is difficult to find a versatile medicine, operation or treatment means. So, some people cannot get away from illness despite medical treatment, some even die. Sometime, medicines are suitable for adult A, but not for adult B who has the same sickness, or do harm to infant A even lead to death; some patients get better by taking virose medicines, but others disable or die; suffering from the same sickness, some people pull through and live for another tens of years, some people die in the operating table; sickness recrudesces in some people whose families break up after several operations, etc.

医学能把人体深层奥秘的生理、病理、病因揭开并掌握，还可以针对性或应变性解决，但难以制造出广谱特效的药物和手术及用各种治疗手段来解决，所以有的病经久治疗难愈，有的病被治死，有的药可以治愈同一种病的甲成人，而不能治愈同一种病的乙成人，或对甲小儿有害甚者易致残亡；有病人服有毒性的药可以治愈病，但有的人服后致残或死；同一种病，有人手术后恢复健康活至几十年，有人死于手术台；有的手术后病情复发，然经几次手术后家破人亡，等等。

David humbly divested himself of his royal attire and, wearing only a simple linen ephod, joined the common people in dancing and worshipping God before the Ark, His "unkingly" behaviour caused his wife Michal to despise him (6:16), and she sarcastically charged him with being base or lowly.

大卫谦卑的脱下自己的王服，只穿一件简单的细麻布以弗得，与百姓一同在约柜前跳舞、敬拜上帝。他「不合国王体统」的举止使他的妻子米甲看轻他（6：16）。米甲嘲讽大卫无耻、轻贱。

It was revealed that the total cell density increased from early March to May, with a variation of 3 order of magnitudes in cell richness; Amphidinium britannicum and Adenoides eludens were two dominant species in the spring, however Gyrodinium viridescence and Peridinium quinquecorne might be abundant in the early summer; the cell density of dominant species inclined from the high-tide zone to middle- and low-tide zone. Finally, the importance of sonification treatment in precise cell enumeration of nature samples was discussed.

发现初春甲藻数量少，而春末夏初数量显著增多，由春初的0～20个/1 000 g湿砂增加到春末夏初的几千个/10 g湿砂，相差3个数量级以上；Amphidinium britanicum和Adenoides eludens为春季优势种；Gyrodinium viridescense和Peridinium quinquecorne在5月份数量明显增多，与温度升高以及底栖藻类各类群总量增加有密切关系；底栖甲藻的总细胞密度和主要优势种的细胞密度呈现由高潮带向中、低潮带增加的趋势。

The effects of solvent on the bromization reaction and oxidant on the formolation reaction of the target product were studied. The results show that the optimum solvent for the bromization reaction and the optimum oxidant for the formolation reaction of the target product were carbon tetrachloride and ceric ammonium nitrate, and their yields were 86.7% and 89.3% respectively.

同时就溴化反应中的溶剂以及甲酰化反应中的氧化剂对两类反应的影响分别进行了研究，结果表明溴化反应的最佳溶剂为四氯化碳，反应产率达到86.7%，甲酰化反应的最佳氧化剂为硝酸铈铵，产率达到89.3%。

The more the number of hydroxyl substitution in phenyl ring, the better the ability of scavenging DPPH free radical. That is, trihydroxy is better than dihydroxy, and dihydroxy is better than monohydroxy. Moreover, when the polyhydroxy exists in phenyl ring and it is ortho-position or para-position, the ability of scavenging DPPH free radical is better too.

当苯甲醯基的苯环上羟基取代数量越多，其清除DPPH自由基的能力越好，三羟基效果优於双羟基、单羟基，双羟基效果优於单羟基；而苯甲醯基苯环上若为多羟基且羟基的位置为邻位或对位的关系时，其在清除DPPH自由基的能力较佳。

In present paper, the progress of quinoline derivatives in synthesis and application are summarized first, then according to a lot of literature, designed the synthetic route for 8 derivatives of 6-AQ. They are 4-chloro-6-AQ, 5- chloro -6-AQ, 5-methoxyl-6-AQ, 7- chloro -6-AQ, 8- chloro -6-AQ, 8-bromo-6-AQ, 8-methyl-6-AQ and 8- methoxyl -6-AQ. All the products were obtained by reduction of its corresponding 6-nitroquinoline.

在对过往文献大量查阅的基础上，本文首先综述了喹啉及其衍生物的性质、合成方法及应用研究进展，并通过对文献报道方法的优化和改进成功地设计合成了4-氯-6-AQ、5-氯-6-AQ、5-甲氧基-6-AQ、7-氯-6-AQ、8-氯-6-AQ、8-溴-6-AQ、8-甲基-6-AQ和8-甲氧基-6-AQ等8种6-AQ的衍生物作为研究新型抗疟疾药物的中间体。

Hodgins has finally identified the full name of the bug he discovered earlier: it's a Carpophilus Nitidulidae, which, interestingly, is usually found on pineapple plants.

Hodgins终于找到了他之前发现的昆虫的全名：这是一个露尾甲科的脊胸露尾甲。其中，有趣的是，这种昆虫通常是被发现在菠萝类的植物中。

Methylene blue is reduced and faded by ascorbic acid in the medium of dilute hydrochloric acid（ pH=2） with sulfanilic acid as a catalyst.The optimal conditions of the fading reaction were investigated in detail.Based on this fading reaction a new spectrophotometric method for the determination of ascorbic acid was established.

确定了亚甲蓝与抗坏血酸褪色反应的最佳条件，在 pH=2的缓冲溶液和对氨基苯磺酸存在的条件下，抗坏血酸能够很快还原亚甲蓝并使之褪色，褪色反应的体系具有很好的稳定性。

The phosphorus oxychloride or phosphorus tribromide N, N-dimethylformamide mix and react to form the Vilsmeier reagent used in the reaction. The newly prepared Vilsmeier reagent is added into the reaction bottle provided with the return condenser and the blender; a reaction raw material N, N-dimethylformamide solution expressed in the reaction formula is added into the system; the temperature is risen; the corresponding multi substituting pyridine-2 (1 H)-ketone compound can be made after the column chromatography of the silica gel; the production rate is between 60 and 95 percent according to different reactions.

由三氯氧磷或三溴化磷N，N-二甲基甲酰胺混合获得反应中所用Vilsmeier试剂；将新配制的Vilsmeier试剂加入装有回流冷凝管、搅拌器的反应瓶中，向体系中加入反应通式中表示的一种反应原料的N，N-二甲基甲酰胺溶液，升温，经硅胶柱层析分离得相应的多取代吡啶-2(1H)-酮类化合物，产率视不同反应在60~95％之间。

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。