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The American Family (1994)

The concept of family life has changed considerably over the years. / In earliest times, several generations lived together in clans, / which consisted of all living descendents and their husbands or wives. / These clans were almost totally self-sufficient, / every member contributing in some way toward the survival of the group. / The men hunted and fished for food or sometimes maintained flocks of sheep or goats. / The women baked bread and roasted the meat their men provided. / Special members of the community were selected to make products like pottery, baskets and home weapons. / But with the development of greater varieties of food, clothing and shelter, / a single clan could no longer develop all the individual skills the group required. / Clans merged into larger societies and at the same time broke into smaller units consisting of married couples and their children. / Later the Industrial Revolution brought about even more important changes in family life. / New inventions brought shorter working hours for men and easier housekeeping routines for women. / Today a productive family life suggests not the group's cooperative efforts of working together, / but the pleasant and meaningful sharing of its leisure.

yoyo谢谢你。

thank you

Unidentified Flying Objects (1995)

There are many explanations for why UFOs visit the Earth. / The most popular one is that they maybe visitors from other planets./ To fly such aircraft, their builders must develop different forms of aviation,/because they seem to fly much faster than normal aircraft./ The UFOs, it is believed, must contain scientists/ from other planets who are studying life on earth./ It is even believed that several such aircraft may have landed on earth/ and the space visitors may be living amongst us./
But there are also less fantastic explanations available./ Although some sightings of UFOs are difficult to explain, most can be explained quite easily./ In many cases the observers might have made a mistake./ They might have seen a weather balloon or an aircraft./ Or the light they saw in the sky might have been light from the ground,/ reflected on to the clouds./ However, the exact cause of many sightings still remained a mystery.