how do

• How did you come by that watch ?
  你怎样得到那只表的？
• How do the populations maintain this homeostasis ?
  种群如何能维持这种内稳定状态呢？
• How did it come about that he knew where we were ?
  他是怎么知道我们在什么地方的呢？
• How did the wild song sparrows gain this knowledge ?
  野外歌雀是如何获得这种能力的？
• How did her speech go over ?
  人们对她的演讲反应如何？
• How do they lie to each other ?
  他们之间的关系怎样？
• How do you distinguish these three parts from one another ?
  你怎么分辨这三个部分呢？
• How did you come by this book ?
  你怎么弄到这本书的？
• How did it find its way into print ?
  怎么会付印的？
• How do acids react on metals ?
  酸对金属起什么反应？