o

• O ! the huanghe ( river ) , cradle of the chinese nation .
  啊！
• Gaskets and o rings are made of elastomers .
  密封垫和O型环是由人造橡胶制成的。
• We call o the additive identity .
  我们称O为加性单位元素。
• The operator o is the null operator .
  算符O是零算符。
• Let us draw the circle with center at o and radius equal to a .
  我们以点O为圆心，以a为半径，作圆。
• The subscript o and w identify the unweathered and weathered states .
  下标O和W分别表示属于未风化和已风化的状态。
• Mohr's circle is required for any oblique plane passing through the point o .
  需要对通过点O的任意斜截面绘制莫尔图。
• Starting from point o a ball is pushed up the suceessively higher ramps .
  从O点出发，把一个球推上一个比一个高的斜坡。
• We should look like spectres, and despair would have taken possession of o us hearts .
  我们看上去像鬼，而且绝望占据了我们的心灵。
• One case of particular importance corresponds d=o, i.e. the two lenses are in contact .
  一个特别重要的情况是do，即两个透镜相接触。