查询词典 synthetic

""Containers and packagings used for food"" means products of various materials including paper, bamboo, wood, metal, enamelware, ceramics, plastics, rubber, natural fibres, synthetic fibres and glass that are used to wrap or contain food, as well as paints or coatings that come in direct contact with food.

食品容器、包装材料：指包装、盛放食品用的纸、竹、木、金属、陶瓷、搪料、橡胶、天然纤维、化学纤维、玻璃等制品和接触食品的涂料。

In February of 2004 , the US Food and Drug Administration FDA imposed a ban on ephedra as a diet supplement but allowed synthetic ephedrine and mahuang used for traditional Chinese medicine to continue to be manufactured and sold .

在2004年2月，美国食品和药物管理局所施加的禁止对麻黄作为饮食的补充，而是让合成麻黄碱和麻黄用于传统中医药继续以生产和销售。

It is a synthetic drug related to the natural substance ephedrine.

这是一种合成的药物，性质接近一种天然的物质『麻黄碱』。

Ursodeoxycholic acid and its epimer chenodeoxycholic acid in synthetic products were determined by thin layer chromatographic scanning.

熊胆是名贵稀有的中药材，其主要成分熊去氧胆酸是溶解胆出醉结石的首选药物。

In some cases, its epimer 4 was also obtained. 22 compounds were synthesized, among them 18 were new.3. Using the intramolecular Pictet-Spengler reaction to form the pentacyclic skeleton of Et-743, the byproducts 25 were obtained under various conditions. The structures of them were determined to be 1, 2-dihydro-isoquinoline compounds, and the mechanism of the reaction was proposed.B. The synthesis of the analogs of Et-743Because of the failure of removing the protective groups in compounds 14, the synthetic strategy was adjusted.

对于苄基保护的羟基化合物13a，顺利得到化合物30，然后与不同的羧酸反应得到18个酯化合物33-50；对于苄氧羰基保护的氨基化合物13b，由于脱除保护基的化合物31在空气中不稳定，所以我们采取不经分离纯化，直接与羧酸反应得到酰胺化合物53-62，然后再分别对其C-21位的羰基进行还原氰基化，得到10个酰胺目标化合物63-72，另外，我们还对羟基转化为氨基的反应进行了探索。3。

The efficient first asymmetric syntheses of-6β-hydroxy-7αH-eudesm-4-en-3-one, and its C-6 epimer were achieved starting from-dihydrocarvone, whichprovide a novel and efficient synthetic method to 6-oxgenated eudesmanes.

以-二氢香芹酮为原料，经五步反应，首次完成了6β-羟基-4(5)-烯-3-羰基桉烷及其6位差向异构体的立体选择合成，并为C-6位含氧官能团取代桉烷类化合物的合成提供了一种简便有效的方法。

Preface uses synthetic high polymer low epispastic stuff makes sole, wearing not only comfortable, and valence cheap, already received a large number of application in shoemaking industry at present.

前言 采用合成高分子低发泡材料作鞋底，不仅穿着舒适，而且价廉，目前在制鞋行业中已得到大量应用。

Synthetic material data and physical model analysis as well as experimental deformation contrast have demonstrated that the deformed gravel underwent the prolonged and simultaneous multi-boundary external force condition and the equilibrant system characterized by intensiveness and scattering.

中文摘要：经过多年的区域地质调查和第四纪环境演变的分析，对庐山芦林盆地大校场谷口剖面松散沉积物中变形砾石进行岩石显微构造学的研究。

An algorithm of eliminating the correlation of synthetic indexes based on index equivalence class is proposed in terms of Dijkstra algorithm. The reduction ranges of evaluation indexes can be reduced, and the anterior reduction results are used to increase the efficiency.

借鉴Dijkstra算法，提出了基于指标等价类的合成指标动态约简算法，即通过等价类划分来缩小参与约简的指标范围，并充分利用前一次约简以求得最终指标约简的结果。

Based on the relation between the SAR image error probability and the synthetic SNR.

在此基础上，研究了噪声干扰对合成孔径雷达干扰效果和评估指标。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失