To convert an existing column into a primary key, click on the column (property in the class) in the diagram.
要转换一个已有的列成为一个主键，在图中点击这个列(类中的属性)。
Prime movers convert the primary sources of energy to mechanical energy that is, in turn, converted to electrical energy by synchronous generator.
把原能源转换为机械能的原动机，再通过同步发电机把其转换为电能。
Prime movers convert the primary energy (fossil, nuclear, and hydraulic) to mechanical energy that is, in turn, converted to electrical energy by synchronous generators.
牵引车转换的一次能源(化石，核能和水力)为机械能就是反过来，中，转换为电能的同步发电机。
Plants and other photosynthetic organisms (such as phytoplankton), which convert solar energy to food, are the primary food source.
植物和其它光合生物(如浮游植物)通过光合作用把太阳能转变为食物，是初级食物来源。
Plants and other photosynthetic organisms (such as phytoplankton), which convert solar energy to food, are the primary food source.
植物和其它光合生物(如浮游植物)通过光合作用把太阳能转变为食物，是初级食物来源。
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