如果一个有机体的环境条件偶尔或经常变得严酷，它可能是有利于这个有机体在生命周期中形成一个抗性阶段的内建。

If conditions within an organism's environment occasionally or regularly become harsh, it may be advantageous for an organism to have a resistant stage built into the life cycle.

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例如，在传媒业，人们经常看到成功的管理人员在办公桌前工作时偶尔吃油炸或煮熟的昆虫。

For example, in the media industry, successful executives are often seen to eat fried or boiled insects from time to time while working at their desks.

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需要经常读取且从不更改或偶尔更改的数据最好由会话bean与JDBC组合来处理。

Data that needs to be read often and never changed or occasionally changed is best handled by session beans with JDBC.

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