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He was levelheaded, schooled in diplomacy, and a capable pilot who studied under his mentor, Captain Jeremoch Colton.
他受过外交训练，因此精于此道。他还师从于杰雷莫克·科尔顿船长，成为一名出色的飞行员。
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The role of nicotine smokers breathe in the production of sperm in the seminiferous tubules of spermatogenic epithelium to spermatogenic dysfunction, which produced a decrease in the number of sperm quality lower.
吸烟者吸入尼古丁作用于生产精子的曲细精管的生精上皮，使其生精功能减退，因而生产出来的精子数目减少，质量降低。
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WGA receptors were also present on plasma membrane of central cell, egg cell and synergid.
连接两个精细胞的横壁也发出很亮的荧光。生殖细胞表面的荧光强度要梢强于精细胞，但差异不明显。
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From Brooklyn Skeptic: 1）来自布鲁克林的怀疑人士, Thank you CASFS Blog:感谢CASFS博客: A small California biotech company,Epicyte, in 2001 announced the development of genetically engineered corn which contained a spermicide which made the semen of men who ate it sterile.
加利福尼亚州的一家小型生物技术公司Epicyte，于2001年宣布研发出一种含有携带杀精剂的转基因玉米，能导致男性食用后产生不育的精液。
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Eight weeks latter, the left testes were harvested for detection of Johsen's score, ultrastructure of seminiferous tubules, intratesticular testosterone concentration and germ cell apoptotic index.
于VT8周后摘取各组大鼠左侧睾丸，检测其Johnsen's评分、生精小管的超微结构、睾丸组织的睾酮浓度和生精细胞的凋亡指数。
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The research demonstrated that the sperm-mediated gene transfer method (direct injection of copulation thecae) can introduce foreign gene into silkworms, and that the foreign gene may be integrated in the chromosomes of silkworms with many copies in series and can be transmitted to G1 offspring.
本研究的结果证明了精于介导基因转移方法能将外源基因有效地导入并整合于家蚕基因组，导入的外源基因可能是以串联多拷贝的形式整合于家蚕基因组中，整合的外源基囚叶＠传午G；代。
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Chinese prints, after a thousand years of development, from woodcuts to the copper engraving, lithographs, from monochrome printing to color overprint by a single print religious literature to develop prints, prints Hua Pu, in areas such as print New Year by the text attached to the Illustrations to be relatively independent of the arts, has made brilliant achievements of ancient Chinese art has become an important part, but also any country in the world and prints pair with more than.
和造纸、印刷术一样，版画艺术的故乡也在中国。版画是在绘画艺术和雕版印刷术的基础上发展起来的，它始于隋，行于唐，扩于宋，精于明，衰于清。经过一千多年的发展，中国版画由木刻版画到铜版画、石版画，由单色印刷到彩色套印，由单一的宗教版画拓展到文学版画、画谱版画、年节版画等领域，由依附于文字的插图到成为相对独立的艺术，取得了辉煌的成就，成为中国古代美术的重要组成部分，而且可以和世界任何一个国家的版画相媲比。
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Nor does baseball go to the other extreme of solitary whanging and counting stopped on the brink of pointlessness, like golf.
也不会走向另一个极端，象高尔夫比赛一样总是于独立作战和精于计算中濒临无意义的边缘。
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Company to "Honesty in the heart, good at line and build a harmonious world" for business purposes, and maintain high-speed sound development.
公司以&诚于心，精于行，共建和谐天地&为企业宗旨，保持高速稳健的发展。
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The results showed that (1) COX-2 mRNA and protein existed in the mature male rat testis. COX-2 was localized in spermatocytes by immunohistochemistry.(2) COX-2 also existed in adult man testis. COX-2 protein was positively stained in spermatocytes and Leydig cells.(3) 2 weeks after administration of rofecoxib, the level of testosterone in the whole testis reached its lower values, being only 50% of control values. However, testosterone level recovered during 4 weeks. After such treatment, histologic examination of these testes showed atrophy of the seminiferous tubules and maturation arrest of spermatogenesis.(4) 2 weeks post-EDS, expression of COX-2 decreased significantly (P.005), in comparison with vehicle-treatment control. 4 weeks after treatment, a new generation of fetal like Leydig cells repopulated in the testicular interstitium resulting in COX-2 expression partially recovered. Although the expression of COX-2 mRNA and protein are enhanced at 8th week after using external testosterone, it wasn't significant higher than control group.
实验研究证明：(1)正常成年雄性大鼠睾丸组织中COX-2在mRNA和蛋白质水平均存在表达，免疫组织化学结果显示COX-2定位于曲细精管内的生精细胞；正常成年男性睾丸组织中同样存在COX-2表达，免疫组织化学结果显示COX-2定位于曲细精管内的生精细胞和Leydig细胞；(2)服用特异性COX-2酶抑制剂rofecoxib 2周后，实验组大鼠睾丸组织内睾酮的含量减少，为正常对照组的50％；持续用药4周后睾丸组织内睾酮浓度逐渐恢复至正常水平；COX-2酶活性降低后病理组织切片显示睾丸内曲细精管萎缩，生精紊乱，持续用药4周时影响最明显；(3)注射特异性Leydig细胞杀灭剂EDS 2周后，实验组大鼠睾丸组织内睾酮浓度降至极低水平时，COX-2的蛋白和基因表达水平也显著低于正常空白对照组（P.005）；使用EDS后第4周，睾丸组织中的睾酮浓度逐渐回升，同样组织中COX-2蛋白表达和mRNA表达水平也相应提高接近正常水平；使用EDS后4周开始给予外源性睾酮，6周和8周时COX-2表达水平的绝对值虽有提高，但与正常大鼠空白对照组比较并无显著性差异，说明外源性雄激素刺激睾丸合成COX-2的作用并不明显。
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a keen bargainer：精于讨价还价的人
a keen mind 敏捷的头脑; | a keen bargainer精于讨价还价的人 | 403 label n.标签 ? vt.把...称为,贴标签于
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be ready at：(敏于); be slow at(不精于;迟钝于)
be clever at(精于;擅长于); be apt at(擅长于); | be ready at(敏于); be slow at(不精于;迟钝于). | 1. Father is much pleased at hearing of your recovery.(听到你痊愈的消息,家父非常欣慰. )
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be skilled in：干..很熟练 ; 精于
be ready for 准备好了的 | be skilled in 干..很熟练 ; 精于 | be suoopsed to 应该
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a green thumb：精于园艺
Red tape:官僚作风,繁文缛节 | A green thumb:精于园艺 | A wet blanket:令别人扫兴的人
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metrician：诗人, 精于作诗者
diapiric fold [地质]挤入褶曲, 底辟 | metrician 诗人, 精于作诗者 | hydraulically operated direction control valve 液压操纵的方向控制阀, 液动换向阀
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orchestrate something like that is your grandfather：精于此事的人只有你外公
and i think we both know the person most likely to|但咱都知道 | orchestrate something like that is your grandfather.|精于此事的人只有你外公 | i have so much respect for tripp,|我很敬佩Tripp
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refine on：精于; 改进
refinance 再为...筹钱, 再供...资金 (动) | refine on 精于; 改进 | refined 精制的; 精确的; 优雅的 (形)
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theoretician：理论家,精于理论的人
cybernetician 控制论工作者 | theoretician 理论家,精于理论的人 | politician 政治家,从事政治者,政客
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worldly-wise：精于世故的
worldly-minded 营求名利的 | worldly-wise 精于世故的 | worldwide 全世界的
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calculative：计算的, 精于计算的, 精明的
calculational | 计算的 | calculative | 计算的, 精于计算的, 精明的 | calculator chip | 单片计算器