键

• An equatorial methoxy group was completely inert to the grignard reagent .
  位于平伏键的甲氧基，则没有这种可能，因而不发生反应。
• A purple intemetallic phase (called purple plaque) is commonly found in bonding .
  键合中常能发现一种紫色的金属化合物，称为紫斑。
• In the valence bond treatment, explicit recourse is made to classical, localized bond structure .
  价键法明显依赖经典的定域结构。
• Good bonds are always accompanied by surface extension, that is, plastic shear strain .
  良好的键合总伴有表面延伸即塑性切向形变。
• The linkages between the stable units must be as near as possible of equal stability .
  稳定链节之间的键必须有尽可能接近的稳定性。
• Scanning in this system stops with the first key down which is encountered .
  在这一系统中，当扫描与按下的第一键相遇时，便停止扫描。
• The absence of the c=n link was noted in the staring thiazanes and thiazolidines .
  未见到在原来的四氢噻嗪和四氢噻唑中CN键的存在。
• The two banana bonds start out from each carbon at roughly the tetrahedral angle .
  这两个香蕉键是从每个碳原子以接近四面体角发出的。
• The triple bond does not usually react so vigorously at a carbon-carbon double bond .
  三键在反应时一般不象烯烃中的碳-碳双键那样剧烈。
• Clearly for better protection, rollover should be provided for more than two keys .
  显然，为了得到更好的保护，需要采用两个键以上的串键。