她从那次考试失败中学到了一个重要教训，即没有什么是确定的。

She learned an important lesson from failing that exam, ___namely that nothing is ever certain.

这座城市的主要交通工具是，即公共汽车、汽车、自行车和摩托车。

The city's main transport options are, ___namely, bus, car, bicycle, and motorcycle.

有几个因素需要考虑，即成本、时间和质量。

There are several factors to consider, ___namely cost, time, and quality.