不必

• Those who don't wish to go need not do so .
  不愿去的人就不必去。
• Unnecessary cost erodes the profits .
  一些不必要的费用影响利润。
• It is n't important enough to worry about .
  这事不大，不必过虑。
• Don't knock yourself out looking for them .
  不必费牛劲找他们了。
• I'll find something, don't bother .
  我总会找到点事儿做的，你不必麻烦了。
• I won' oblige you to stay here any longer .
  你不必再待在这儿啦。
• Don't worry, he knows his onions well .
  不必担心，他是有办法的。
• This is usually an unnecessary refinement .
  这通常不必过分精细。
• I do n't think we have to tell him everything .
  我觉得不必事事都告诉他。
• Clear your face: you shan't scowl at me !
  脸色开朗些，你不必对我皱眉头！