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Three alicyclic dianhydrides, 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,4,5-cyclopentanetetracarboxylic dianhydride, and 1,2, 4, 5-cydohexane tetracarboxylic dianhydride were polymerized with two aromatic diamines, 1,4-bis (4-amino-2-trifluoromethylphenoxy) benzene (6FAPB, a) and 4, 4'-bis(4-amino-2-trifluoromethyl phenoxy) biphenyl (6FBAB, b) respectively, via a two-step polycondensation procedure to afford two series of fluorinated semi-alicyclic polyimides.

分别将脂环族二酐单体1，2，3，4-环丁烷四酸二酐、1，2，4，5-环戊烷四酸二酐和1，2，4，5-环己烷四酸二酐与芳香族含氟二胺1，4-双（4-胺基-2-三氟甲基苯氧基）苯(6FAPB， a)和4，4'-双（4-胺基-2-三氟甲基苯氧基）联苯(6FBAB， b)反应制备两个系列的含氟半脂环族聚酰亚胺，研究了PI薄膜的热性能和光学性能。

He's not only a three-letter man,he's also a straight A student,you know,one of those All-American types.

他不仅仅代表三个球队，他的学业成绩也都全都是A，你知道，他就是那种人人都想成为的美国理想人物。

METHODS: A retrospective study of outcome of LASIK (Allegretto excimer laser system and Moria C-B microkaretome) for predominant myopic astigmatism (group A, 28 eyes) and normal myopic astigmatism (group B, 30 eyes).

分析LASIK技术（鹰视准分子激光系统和MORIA C－B微型角膜刀）治疗以散光为主眼(A组，28眼)和以近视为主眼(B组，30眼)的术后结果。

It suggested that allele A had a positive effect on the meat production and quality of Langya Chicken.

结果表明：等位基因A对琅琊鸡的肌肉产量和品质具有正效应。

This study was aimed to investigate the molecular genetics basis of a novel allele HLA-A+2459 in Chinese population.

本研究探讨HLA新等位基因HLA-A*2459的分子机制。

A green indicator on the screen means that the normal key set is currently active.A red indicator on the screen means that the alternate key set is currently active.

在屏幕上绿色指示灯是指正常的关键，目前active.A设置在屏幕上的红色指示灯意味着备用键设置当前处于活动状态。

Results Average neurobiotin concentration in the coupled ON cone bipolar cells was lower than that in the coupled AⅡ amacrine cells.

相对于AⅡ-AC 和ON-CB间可能的异源型缝隙连接，NB较易通过AⅡ-AC间的同源型缝隙连接。

Vitamin A not only can synthesize inspect amaranthine qualitative, it is clearer to still can make the eye sees a thing below dark light, accordingly, green tea not only can eliminate computer radiant harm, still can be protected and raise eyesight.

维生素A不但能合成视紫红质，还能使眼睛在暗光下看东西更清楚，因此，绿茶不但能消除电脑辐射的危害，还能保护和提高视力。

A: I am Ra. This is a very ambiguous question.

A ：我是拉。这是一个非常模糊的问题。

Ancient Egyptian sun god with the head of a hawk; a universal creator; he merged with the god Amen as Amen-Ra to become the king of the gods

a。 现成的，(常指廉价的，质量不高的)用旧的，千篇一律的n。现成的衣服，旧东西，二手货 reachn。延伸，范围，河段v。到达，伸出，延伸

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。