1. This is the trick that permits indoor, parachute-free "sky diving".
    这就是室内无伞蹦极跳得以进行的诀窍。

2. He asked sarcastically. ´You should have declared that. Perfume is not exempt from import duty.´
    他带着讥讽的口吻问道,"你该申报一下,香水是不免税的."

3. He may never be sure where the next meal is coming from, but he is free from the thousands of anxieties which afflict other people.
    他可能从不知道下顿饭有无着落，但他不像有人那样被千万桩愁事所折磨。

4. During her "free" period from 2 to 3 p.m., Mrs. Cox has to meet with parents, order supplies, make out examinations, check assignments, and take care of many other things.
    下午2点到3点是她的“空闲”时间，她在这段时间里会见家长，定购教学用品，出考试题，批改作业，还要料理许多杂事。

5. Dr. Hornsnagle, an American explorer, asked the ruler of Yap Yap whether free speech was allowed under his rule.
    美国探险家洪斯纳哥博士问汪汪国的国王，在他统治下是否允许言论自由。

6. Do your duty
    做做好事

7. During 1994, for example, 61 officers (54 men and seven women) were forced into early retirement after being attacked on duty.
    例如，1994年，共有61名警员（男性54人，女性7人）由于履行职责时遭受攻击而不得不提早退休。

8. Designing cities according to the traditional concept that hard work is a moral duty, those who rebuilt Japan after World War II left almost no room for recreation.
    二次大战之后重建日本时城市规划所依据的仍是传统的勤奋工作的道德观念，没有为娱乐活动留下空间。

9. ´You should have declared that. Perfume is not exempt from import duty.´
    "你刚才应该申报，香水要上进口税的。"

10. An advertisement which begins with the magic word FREE can rarely go wrong.
    凡是用"免费"这个神奇的词开头的广告很少会失败的。