strains

例句:

• The presidential vote exposed strains in the ruling coalition.
  来自BBC
• She could hear the tinny strains of a chamber orchestra.
  她能听见室内管弦乐队尖细的旋律。
  
• In some developing countries, drug-resistant strains are rampant.
  来自WSJ
• The strains of office are beginning to tell on the prime minister.
  首相开始感到公务繁忙的压力了。
  
• Every year new strains of influenza develop.
  每年都有新的流感病毒出现。
  
• The strains in the financial system extend beyond Europe.
  来自WSJ