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为了延长软件的生命周期，常常要进行软件版本升级，其主要目的是减少错误、扩充功能、适应不断变化的环境。
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Exports are either raw materials or manufactured goods. Raw materials are products of the land， such as cotton， timber or rubber. Some raw materials， such as iron ore， come from mines. These raw materials are often exported by the countries that produce them to other countries where they are made into manufactured goods. Some countries produce food for export， for example， meat， sugar， or cereals such as wheat and maize. These countries are agricultural countries. An agricultural country needs fertile land and a good climate. A cold， dry climate is not suitable for agriculture. A country which produces manufactured goods is known as an industrialized country. An industrialized country cannot always produce enough food for its own needs. In this case， it does not export foodstuffs. Instead it has to import them. It relies on exports of manufactured products and pays for imports with the money it earns from the exported goods. The countries which produce food for export, for example, meat, sugar, or cereals such as wheat and maize are countries.（）
白居易之弟白行简，字知退，有作古代唯一仅见以文学形式描写男女交欢的作品，其旨叙述人伦，延年保寿，此名作是？
可编程ROM可简记为（）
饱和蒸汽压就是汽液平衡时蒸汽所产生的压力。
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