1. All natural systems tend toward balance among opposing factors or forces.
    所有自然体系都趋向于在各种对立因素或力量中保持平衡。

2. Some wives tend to believe that their husbands are infinitely resourceful and can fix anything.
    妻子常常认为她们的丈夫无比聪明能干。

3. People tend to amass possessions, sometimes without being aware of doing so.
    人们有积聚财物的倾向，有时却没有意识到在这样做。

4. People tend to amass possessions, sometimes without being aware of doing so.
    人们喜欢收藏东西，有时并没有意识到自己在这样做。

5. People tend to live longer in most places. In Central Europe, however, life span is dropping because health care is not what it was a few years ago.
    在大多数地区人们的寿命越来越长。但是在中欧，由于卫生保健不如前几年，因此寿命正在缩短。

6. Joe and Malcolm Gauld both say children tend to do their utmost when they see their parents making similar efforts.
    乔和马尔科姆都说，当孩子们见到自己的父母都在全力以赴时，他们也会竭尽全力。