labored

• This cuts the labor of evaluating integrals almost in half .
  这几乎省去求解积分的一半劳动。
• In addition, urban migrants add to the supply of labor .
  此外，城市移民还增加了劳动的供应。
• "the first labor is usually protracted," the nurse said .
  “初产通常是拖得很长的，”护士说。
• Total labor productivity rises in the economy as a whole .
  经济中劳动生产率总的来说是上升的。
• You should change gear -- the engine 's starting to labor .
  你该换挡了发动机有些吃不住劲了。
• It cost me much labor .
  费了我不少劳力。
• Leisure does what it likes; labor does what it must .
  闲暇是做你喜欢做的事，而劳动是你必须做的事。
• His labors are over .
  他的一生结束了。
• I want labor to understand the inner workings of the company .
  我愿意让劳工了解公司内部的工作情况。