The aim is to inspect the functions and peculiarities of a general fourth generation language(4GL) by means of analysing a specific 4GL tools environment.
目的是想通过一个具体的第四代语言（4GL）工具环境的分析，来考虑第四代语言工具环境所应具有的功能与特征。
Regarding economy, source of energy and environment as a whole, natural gas will become the fourth generation source of energy instead of crude oil in the twenty first century.
从经济、能源、环境整体来看，廿一世纪天然气将替代石油成为人类第四代能源。
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