1. When people added one extra day to February every four years, they were adding 24 hours, whereas they should have added only 4 times 5 hours, 48 minutes and 46 seconds — a total of 23 hours, 15 minutes and 4 seconds.
    人们每四年给2月增加一天，这就增加了24小时，但实际上他们应该增加4个5小时48分46秒——一共是23小时15分4秒。

2. North of the equator about 61 percent of the surface is covered by water.
    赤道以北, 大约百分之六十一的表面为水所盖.

3. North of the equator about 61 percent of the surface is covered by water.
    赤道以北, 大约百分之六十一的表面为水所盖.

4. 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。