maintain

• Machinery ought to be well maintained all the time ...
  机器应该随时注意维护。
• They were maintained by normal self-pollination .
  它们保持正常的自花授粉繁殖。
• He maintained a hard, careless deportment .
  他保持一种严酷的，漠不关心的态度。
• We should maintain a lofty stance .
  我们应对此保持高姿态。
• Nothing can be compared , he maintains ,
  他认为无可比拟。
• Whate'er may betide , maintain your courage .
  无论有什么事发生，都不要惊慌失措。
• What does the theory of plate tectonics maintain ?
  这板块构造学说的理论讲些什么？
• The officials maintained silence about the talks ...
  官员们对于会谈情况保持缄默。
• Sinus rhythm can often be maintained with quinidine .
  奎宁丁常可用以维持窦性节律。
• There is no need to maintain a strict alphabetical sequence .
  不必保持严格的字顺。