钱学森对我国科学技术的重大贡献是多方面的，他以总体、动力、制导、气动力、结构、计算机、质量控制等领域的丰富知识，为组织领导新中国火箭、导弹和航天器的研究发展工作发挥了巨大作用，对中国火箭导弹和航天事业的迅速发展做出了卓越贡献。

    Americans like to travel on their yearly holiday. Today, more and more travelers in the United States are spending nights at small houses or inns(客栈) instead of hotels. They get a room with breakfast the next morning.

    Rooms for the night in private(私人的) homes with breakfast have been popular with travelers in Europe for many years. In the past five or ten years, these bed and breakfast places have become popular in the United States. Many of these American's bed-and-breakfast inns are old historic buildings. Some bed-and-breakfast inns have only a few rooms, while others are much larger. Some inns do not provide telephones or televisions in the rooms, but others do.

    Staying at a bed-and-breakfast inn is much different from staying at a hotel. Usually the cost is much less. Staying at an inn is almost like visiting someone's home. The owners are glad to tell about the areas and the interesting places to visit. Many vacationers say that they enjoy the chance to meet local families.