定期

• They placed very stable and accurate atomic clocks on regularly scheduled jet airliners .
  他们将非常稳定、准确的原子钟装在定期飞行的喷气式班机上。
• Mortality is the number or volume of trees periodically rendered unusable through natural causes .
  枯损是一类由于自然原因而定期变得无用的林木株数或材积。
• None of the officers in the squadron had ever eaten so well as they ate regularly in milo's mess hall .
  中队里的军官们在哪里也没有象定期在迈洛主办的食堂里吃得那样惬意。
• We regularly briefed former president johnson and some of his advisers for years after they left office .
  在前总统约翰逊和几位顾问离职后好几年，我们还是定期向他们汇报情况。
• Darling, i don't want to hurry you, but didn't you say you were going to buy a commutation ticket this morning ?
  亲爱的，我本不愿意催你，可是你不是说今天早晨要去买定期车票吗？
• Invading woody vegetation, especially of the same species, should be controlled periodically to prevent confusion .
  入侵的木本植物，特别是同一种类的，应当定期地除去，以防止混杂。
• This is in contrast with an overdraft which is subject to periodic review and is in principle recallable at any time .
  这同透支不向，透支要接受定期检查，且在原则上可随时要求还款。
• At least 10 centers for needy families regularly dispense free groceries to them in the cleveland suburbs .
  在克利夫兰郊区至少有十个为贫困家庭服务的中心，定期给他们发放免费家庭用品。
• He spends the winter in the west indies and summer in england, commuting back and forth like the migrating swallows .
  他在西印度群岛过冬天，在英国过夏天象定期移栖的燕子一般固定来回。