Liptobiolites occur only in the primary generation and in the early stage of the middle generation.

残植煤类仅出现在初始世代和中期世代的早期阶段。

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Mechanism of secondary hydrocarbon generation was discussed and considered to be continuous with the primary generation.

对二次生烃机理进行了讨论，认为二次生烃与一次生烃连续。

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Primary key generation and unknown primary key field handling is now becoming supported, and more people are beginning to use it.

现在已经开始支持自动生成主键和未知的主键字段处理，而且越来越多的人开始使用它。

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Sustainable forms of energy can also play a key role in income generation - a primary path out of poverty for the millions who do not have access to reliable grid-distributed electricity.

BBC: Powering our way out of poverty

The final factor may sting for some up-and-coming schools without a storied tradition and history, but no one can deny that revenue generation is the primary concern for the NCAA and BCS, and certain storied programs like Notre Dame, Ohio State, USC and Alabama will sell huge numbers of tickets and bring in a tremendous amount of television advertising revenue for a BCS bowl game.

FORBES: Fixing The College Football Bowl Championship Series

For this age group, the internet will remain the most dominant medium in their lives, as it will be for the following generation who even at primary school are using the web to do their homework.

ECONOMIST: Now they have assumed power, what will consumers do with it?