1. From time to time they slapped at the mosquitoes, or put their heads into the smoke to get rid of the pests.
    他们不时还拍打着蚊子，或是把他们的头放到烟幕中来驱除害虫。

2. For many, the departure at the airport is the worst time.
    对许多学生来说，在机场与亲友告别是他们最难受的时候。

3. For him, schools are an out-of-date concept from the days of the town crier (市政传令员), when it was difficult to get information and a central person was needed to communicate knowledge.
    在他看来，从靠市政传令员口述传达重要信息的时代以后，学校已是过时了。当时人们很难得到信息，因而需要一位重要人士来传递信息。

4. From time to time, according to his theory, passing ships and planes set off the crystal, which confuses their instruments and sucks them into the ocean.
    按照他的理论，过往的船只或飞机时不时会触动那块水晶，于是它会干扰它们的仪器，把它们吸入海底。

5. Finally, she'd say, "Well, if I can find time today, I'll call the medical worker."
    她最后总会说：好吧，如果今天我能抽出时间的话，我会找医务人员的。

6. For example, one U.S. corporation offered a large sum of money in support of a U.S. presidential candidate at a time when the company was under investigation for possible violations of U. S. business laws.
    比如，有一家美国企业曾因可能触犯美国商业法规而正受调查，此时它捐出一大笔款项支持一位总统候选人。

7. For a short time, both men looked out over the river towards the great bridge.
    有一小会儿，两人都望着河上的大桥。