必要

• If need be , i can do extra work at the weekend .
  必要时我可以在周末加班。
• Is it necessary for me to buy a pair of water-skis ?
  我有必要买双滑水屐吗？
• However, encouragement may be given if necessary .
  不过必要时可以给予鼓励。
• There is no sense to worry about that .
  没有必要为此而着急。
• There is no sense throwing dirt at it .
  没有必要故意丑化它。
• I must go now , i.e. i feel obliged to go .
  我现在得走了，即我觉得有此必要。
• There was no reason for undue haste .
  没有必要过份仓促行事。
• Did you need to spoil it by making me nauseous ?
  难道你真有必要倒我的胃口吗？
• It is not necessary to go into all of it .
  没必要刨根问底。
• There was no need to discuss the implications .
  没有必要去讨论这些牵连关系了。